Research Trends in Career Success: A Bibliometric Review

: The purpose of this article is to provide an overview of academic research on professional success, using the bibliometric analysis to understand the evolution of this ﬁeld between the years 1990 and 2020. The information was obtained from the publications indexed in the Scopus database, under a rigorous bibliometric process that comprises ﬁve parts: (i) criteria search of the ﬁeld, (ii) selection of database and documents, (iii) inclusion and selection criteria, (iv) software and data selection, and (v) analysis and results. The results show professional success as a scientiﬁc discipline in full exponential growth, which allows us to consider the main contributions of authors, institutions, and international contributions, as well as to consider the main themes that have shaped the intellectual structure of the subject through their visualization using bibliometric maps of co-citation and co-occurrence, which combined showed eight main lines of research. The results obtained allowed us to identify patterns of convergence and divergence in various topics, which allows obtaining current and diverse information on the state of the research ﬁeld’s art.


Introduction
Interest in researching career success has increased in the last 30 years, and this is also due to the increase in the number of graduates from higher education institutions [1]. This is why managers need to maintain a link between the university and their former students since the quality of their training process is related to their success in the labour market [2]. As a result of the monitoring of graduates, experts in the field of education and the labour market indicate that there is a considerable percentage of students who are not working in their specialties, which translates into job dissatisfaction [3].
Professional success starts from the etymological meaning of the word "success", which comes from the Latin "exitus" which means exit, a final and satisfactory result of a task [4]. Professional success is known as the accumulated positive achievements of people, real and perceived, as a result of their work experiences [5][6][7][8]. This definition shows the need to divide the analysis of success into extrinsic or objective components [8][9][10] and intrinsic or subjective of the individual [6,11,12]. Objective career success is evaluated in terms of salary and promotions [12]; while subjective success refers to the evaluation of the individual's own criteria on the progress of the career [13]. To achieve success, a balance of four dimensions is necessary: personal, professional, business, and family [14].
In this field of study, the factors that influence professional success have been related [15]. Objective factors include good salary [16], age [17], labour promotion [18], recognition [19], work in a prestigious company, leadership [20], and teamwork [21]. On the other hand, the main subjective factors are the following: achieving happiness [22], gender [23], professional and job satisfaction [24], emotional intelligence [25], fulfilment of goals [5], and ethical behaviour [26]. These factors are the main variables attributed to professional success and have been studied throughout the literature [7,27,28].
Professional success is related to various areas of knowledge, including the influence of gender. When competing with men in the chosen field of training, the professional problems faced by women were analysed while still fulfilling the main role of mother and wife [29]. Successful women serving as corporate directors in Canadian companies are recognized due to their high level of training, entrepreneurial experience, and having reached a high occupational level [30].
Additionally, it is recognized that self-confidence, good communication skills, and academic improvement courses are the most important factors for success and professional advancement [31]. Good command of communication is essential for achieving the personal and professional success of students in the future [32]. In a study aimed at professionals in business, informatics, and engineering, attached to the Master's in Information Systems (MIS), of the University of the State of California, it is showed that professional success does not depend exclusively on technical skills in computer science but also communication and interpersonal skills [33].
In the industrial sector, graduates of engineering programs who achieve professional success possess effective communication and information skills [34]. In industrial health management, the factors that increase economic income do not affect life satisfaction. The only predictor of satisfaction is feeling safe while working outside of their home organizations [35].
The field of medicine shows that medical teachers who dedicate more than 50% of their time to clinical care have less time in tutoring. This contributes to notable differences in the promotion and greater dissatisfaction with academic medicine [36]. Mentoring is considered a key factor in professional development, and it has been shown that people who have received tutoring present greater opportunities for promotion, higher salary, and professional satisfaction [37].
On the other hand, intelligence quotient (IQ) and, consequently, high undergraduate grades influence the rate of increase in income over the long term and do not influence the starting salary [38]. Human resource development needs to apply new means to assess professional development. Therefore, both objective and subjective factors must be included because traditional assessment methods are inadequate for capturing change and progress [39]. Finally, previous undergraduate internships' participation generates advantages in early career success, which includes: less time to obtain the first position, higher salary, and general job satisfaction [40].
Research in the field of career success has been strengthened in recent years. However, a global analysis of the issue has not been carried out. Bibliometric studies are a recently used research tool for analysing scientific activity in a specific field of study [41,42]. The bibliometric analysis allows one to quantitatively evaluate the impact of the research, recognizing past particularities and critical points in the present, in order to suggest research trends [43].
Thus, in this field of study on professional success, the following research questions arose: (1) What are the trends in professional success? (2) Which authors had the greatest impact in the field of professional success? and (3) What is the intellectual structure of this professional success knowledge base?
This study aims to carry out a bibliometric analysis by collecting information from the Scopus database to understand the intellectual structure and trends on professional success. This article is made up of four main sections: First, following the introduction, the materials and methods section are presented, which describes the database used, as well as the search predictors used. The second section describes the research's outstanding results, showing the trends and new research lines. Third, there is the discussion, where the main relationships between the different results presented are summarized. Finally, the fourth section includes the conclusions of the investigation. It is worth mentioning that supplementary material is added where secondary tables are included. Finally, a section of the references used in this research is added.

Materials and Methods
Analysing an academic field requires meticulous work on the researcher's part, allowing the researcher to deepen and increase knowledge. This is achieved by using a rigorous and formal procedure that allows the process to be reproduced and made transparent, called a systematic review of the literature [44,45]. This rigorous process is characteristic of bibliometric analyses [46,47].
Bibliometrics is considered a research field, which allows analysing scientific production and its performance according to its authors, countries, institutions, and journals [48][49][50]. That is, it allows for the studying of the structure of an academic discipline or area of knowledge [51]. These analyses are complemented with visualization maps, called bibliometric maps or scientific maps, allowing one to observe the structures and their connections of the various investigations, disciplines, and research fields [52,53].
In this study, a systematic process was established (see Figure 1): (i) criteria search of the field, (ii) selection of database and documents, (iii) inclusion and selection criteria, (iv) software and data selection, and (v) analysis and results.

Criteria Search of the Field
This research seeks to assess the conceptual evolution of the research topic through a combination of two approaches: (i) performance analysis and (ii) science mapping [52]. The first, performance analysis, allows one to evaluate the impact of publications by contrasting information that relates these documents to related authors, countries, and institutions. The second approach is bibliometric mapping, also called science mapping, which is a graphic representation that allows for the visualizing and identifying of the structure of the field of study and its relationships with the main research topics [52,60].
These analyses require identifying the field of study; therefore, it is necessary to use descriptors that allow it to be limited. For this purpose, the terms used were "professional success" [61,62] and "career success" [63,64], which have been used interchangeably by researchers in this area.

Selection of Database and Documents
In bibliometric studies, it is necessary to use a source or database that is reliable and of quality to proceed to extract the required information. The Scopus database is selected due to its (i) wide coverage of journals in most fields of knowledge; (ii) high-quality standards (for example, indicators such as Scimago Journal Rank); (iii) tools for data visualization and analysis; and (iv) easy access to your references [65][66][67].
The data were extracted from the Scopus database in January 2021, using the mentioned descriptors and a combination of widely accepted variables in bibliometrics related to "titles, abstract, and keywords", allowing one to obtain the following topic search: (TS) = (TITLE-ABS-KEY ("Professional success") OR TITLE-ABS-KEY ("career success")). In the initial search, 2937 documents were obtained.

Selection Criteria
In this third phase, criteria were established which made it possible to refine the information obtained, the documents published between the years 1991-2020 were considered in order to analyse the intellectual structure of the field of study of the last three decades, and 2021 was excluded because it was the year in course. It was limited to scientific articles since they are considered the most representative of scientific activity due to their visibility, impact, and knowledge certified by blind peers [68,69], and 1956 articles were obtained from this restriction.
The data obtained from Scopus were downloaded in CSV format (comma-separated values), displaying information on the scientific production of the field of study, such as the authors and their affiliations, title and year of publication, keywords, and abstract, among others, which are considered relevant. This bibliographic information must be reviewed and refined, eliminating duplicate files or errors in the records [70], and 15 articles were discarded among erroneous and duplicate documents; that is, a base of 1941 articles was obtained.
Additionally, a manual analysis of the selection of articles was carried out by the authors. This selection made it possible to obtain an inclusion criterion for articles that meet a definition of professional success proposed by the author Judge [64] "The real or perceived achievements that people have accumulated as a result of their work experiences." The authors made this selection, who independently carried out the manual refinement of the documents, a procedure that ensures the quality of the information by reducing outliers [53,71]. As a result, a database of 1369 articles was obtained related to the study topic; that is, the 572 articles that did not meet the established definition and scope of the study were eliminated.

Software and Data Selection
Next, we proceed to the selection of the software to be used based on the data selection. Excel software has been used for data cleaning and performance analysis corresponding to the results section [72]. About the analysis of the structure of the field of study, bibliometric maps were constructed using the VOSviewer software, version 1.6.16 (University of Leiden-Netherlands), which allows for the formation and visualization of a bibliographic network, using graphs of two dimensions [73]. This software has been used in other studies in various areas of knowledge [74][75][76][77].

Analysis and Results
Data analysis is done in two stages. The first is a statistical analysis of the data, which allows for the performance analysis of the intellectual structure, considering the growth patterns of publications and the contributions made by the main countries, universities and authors, and the renowned journals in the field of study [52]. The second corresponds to the analysis of the intellectual structure through the construction of bibliometric maps. The cooccurrences of author and co-citation words (authors and journals) are examined, allowing for a broad understanding of the structure to be obtained for the field of study [55,78,79].  Period I-Introduction (1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000): During this period, 147 articles were published, representing 10.74% of all publications on this subject, with 8196 citations. Some initial research focused on professional success and gender relations, analysing from the professional trajectory [80], cognitive ability [81], and social and personal attributes [82], as well as work style and job satisfaction [24]. Later studies continued the study of professional success from an individual approach with the organization, examining human capital [83,84], personality [8,64], individual, family and organizational differences [11], and motivational variables [85]. Other studies propose political influence [7], being protected or having a mentor [86], social achievements [19], or rewards related to job promotion and salary increases [27]. Finally, studies related to subjectivity-objectivity [4,87], objective (extrinsic), and subjective (intrinsic) success [8,64] were developed.
Period II-Growth (2001-2010): Greater development of the study field is exhibited, with 315 documents (23.01%), allowing 17,529 citations to be obtained. In this period, investigations were carried out that were related to professional success with personality [5,[87][88][89], employability of the professional [90,91], and job or professional assistance networks [92,93]. Other authors considered some influences that can modify professional success when examining the value of mentoring and the actions of mentors [94][95][96] professional self-efficacy [97], professional attitude [98], the value of work [99], or ethical behaviour [26]. Situations related to the individual as a professional are also examined, considering happiness [100] or physical stature [101].
Period III-Maturation (2011-2020): A significant increase in the number of publications is observed, from 315 in period II to 907 publications in this period, representing 66.25% of the total number of publications and 11,530 citations. During this period, studies were developed that relate professional success to work activity, considering employability [102], professional adaptability as a psychosocial resource [103][104][105], flexibles professional practices [106], or vocation and labour commitment [107]. Other researchers studied the relationship between professional success in the individual through their personality roles [108], narcissism [109], dispositional positive affect [110], their behaviour in professional networks [111], gender [23], or their culture of origin and place of reception [61]. Some variables related to the individual's career were also considered, such as factors of professional success, investigating mobility and employability [112], the perception of career management [113], career advancement [18], or the impact of a tutor on their work activities [114,115]. In recent years, it has been considered to study professional shocks as unexpected events in the professional career [116], the genetics of the individual linked to their education [117], creative cognition [118], the impact of international work experience [119], or happiness, considering that they can receive higher income and exhibit better performance [22]. Other studies looked at subjective career success through professional proactivity [120] and leadership [20].
Additionally, Price's law has been used for the productivity analysis of a field of study [121][122][123], which determined that it fits an exponential growth model (y= 7.0643e 0.0926x ) where the value of R 2 = 0.9002 (see Figure 2).

Contributions by Countries
The contribution of the different countries was established considering the affiliation of the authors of the articles. The results show the collaboration of 76 countries. Table 1 shows the 15 main countries that have contributed to this field of study, from Europe (8), Asia (4), America (2), and Oceania (1).
The United States leads the ranking of the most influential countries with 603 documents and 23,628 citations. This is due to the importance that the field of study has generated in recent years when considering labour resources and their demands related to personal satisfaction and professional success [124]. The second-place corresponds to the United Kingdom with 133 documents and 3915 citations. The third and fourth places correspond to Canada and Germany, respectively. Belgium has the highest average citations (45.20) of the group. This cooperation between countries needs to be analysed using science maps. For this purpose, the VOSviewer software was used, identifying those who have made at least five contributions to professional success. Figure 3 shows the bibliographic coupling analysis of countries, exhibiting 38 nodes (countries) in six clusters and maintaining 688 links of relationships. The strength of cooperation can be seen in the width of the links. The United States is the central nucleus, presenting 37 collaborative relationships (links), with greater intensity than Germany, Canada, France, the United Kingdom, and Australia. Whereas the United Kingdom frequently collaborates with the United States, China, and Canada. Countries with a reduced number of collaborations, such as Nigeria, Argentina, and Brazil, are shown.

Featured Authors
In the professional success study, the 1369 articles have been written by 3106 authors. Authors who mostly present a single publication (87.99%), two publications (8.15%), three publications (1.74%), and four or more (2.12%). In Table 2 Four works are highlighted in the top 15 of most cited documents (see Table 3

Frequently Cited Documents
To assess a field of study, it is necessary to consider documents based on the citations obtained [122]. The scientific production of professional success (1369 articles) presents 37,255 citations. Table 3 shows the publications which are part of the 15 most cited documents on professional success and represent 1.09% of the total.
The article with the highest number of citations is published by Seibert S.E., Kraimer M.L., and Liden R.C. in 2001 in the Academy of Management Journal. This study shows that social resources positively affect professional success, based on three main advantages offered by the network: career sponsorship and access to information and resources [63]. Followed by the article published in 1999 in the journal Personnel Psychology, in this article, the relationship of the personality model traits, based on five factors and mental faculty, with professional success, was analysed [64]. Finally, the third most cited article was the one published in 1995, in the journal Personnel Psychology by Judge et al. [83], where it was already considered that certain variables intervene in professional success, both objective (salary and ancestry) and subjective (job satisfaction and professional satisfaction). Other articles that have generated more than 300 citations are displayed in the table in question.

Journal Performance
This analysis allows an overview of the field of study to be obtained by knowing the journals in which the various documents and fields of knowledge have been published [50]. The subject of professional success has been considered by 691 journals, where the 15 most important ones represent 25.64% of the scientific production and have 50.49% of the citations. Table 4 shows the 15 most important journals based on the number of publications, along with performance indicators: Citescore, Scimago journal rank (SJR), and source-normalized impact per paper (SNIP). The most important journal based on its production is the Journal of Vocational Behavior

Co-occurrence Network of Author Keywords
This bibliometric analysis represents the connection between the keywords, forming a network where those that appear more frequently in the study subject are indicated, thus allowing one to examine concepts (keywords) and themes (grouped concepts in clusters). This analysis was run with the VOSviewer software, which generates a visual and multidimensional representation of the data [59,133].
A total of 2777 keywords were obtained from the database, of which 116 remained in the documents with an occurrence of at least five times. These various topics were divided into 10 groups (see Table S1 in the Supplementary Materials section). Figure 5 represents these eight groups, with 92 nodes, 675 links, and a total link strength of 1290. The term "career success" has 276 occurrences and a relationship with 71 terms; it is in Group 3 (blue colour) as the most relevant word. According to the number of nodes (20), the most extensive research area is cluster 1, coloured red, as shown in Figure 5. This class is called: 'Career and Gender', since the two terms of the highest co-occurrences are career and gender, with 108 and 76 co-occurrences. In this area, authors such as Sosik study the relationships between orientation to learning goals, transformational leadership, and professional success expectations [134]. Much of the choice of occupation is attributed to the types of occupations considered suitable for men and women [135].
Otherwise, it seeks to generate information about the factors that influence women's disadvantageous workplace position [136]. Currently, according to Jang studies, gender measured the link between domestic office chores and promotion in such a way that the relationship was statistically revealing for men but not for women [137]. From the evaluation of the relationship between having a mentor and objective professional results, having a mentor is associated with better professional advancement results [133]. Mentoring is a professional partnership between a mentor who cooperates with her professional experience with an apprentice to train him with similar problems [138].
According to the number of nodes (11), the second most extensive research area is cluster 2, coloured green: 'Objective and Subjective Career Success'. Currently, there is a difference between objective and subjective professional success; external persons value the former according to the level of work, income, status, salary, and occupation [139]. On the other hand, subjective career success is a subjective construct that interprets individual employees' success. It was evidenced that the person-work adjustment intervenes in the relationship between perceived professional support and subjective professional success [140]. In recent years, the effects of emotional and social competencies on the boundless career and objective career success have been investigated [141].
The third research area is cluster 3, with 13 nodes (blue), as shown in Figure 5. This cluster is called 'Career Success', since this term has 276 occurrences and is led by the authors Seibert S.E., with 1221 citations [ [129], and Van Der Heijde C.M. with 450 citations [90], which shows a growing interest in this line of research. The authors of this group have provided several studies, such as Parasuraman, which analyses work and family variables involved in career success and psychological well-being [130]. On the other hand, the theory of labour adjustment is explored, showing the relationship between person-organization adequacy and professional success [132].
Cluster 4 (yellow), made up of 11 nodes, represents the fourth research area, 'Emotional Intelligence' since this term is the one with the highest co-occurrence in this cluster (27). Regarding emotional intelligence, it is considered one of the main qualifiers for professional success [142]. Likewise, a high degree of emotional intelligence indicates a high business potential, which leads to greater professional success [143]. It examines three professional competencies (perceived job satisfaction, perceived internal marketability, and perceived external marketability), recognized as predictors of success in the borderless career [131] and has 436 citations. Subsequently, the relationship between structural empowerment, innovative behaviour, self-efficacy, and professional success is proposed [144].
The fifth research area is cluster 5 (purple), made up of 11 nodes called 'Job Satisfaction'. In this cluster, in Drewery's research, objective and subjective indicators are attributed to professional success; within the subjective ones, job satisfaction is included [145]. Likewise, wellbeing, life goals, and values must be considered to achieve job satisfaction [146]. On the other hand, human resources are essential to identify the factors that affect job performance [147]. Finally, the attribution of the perception of evaluation centre workers regarding their job satisfaction and organizational commitment is investigated, which is one of the key elements for predicting work behaviour [148].
Cluster 6 (light blue) represents the sixth research area, made up of 10 nodes, and is called: 'Higher Education' because it is the term with the highest occurrence (20) in this class. According to Ummatqul, higher education graduates require managing, in addition to professional skills and soft skills, including the ability to communicate, coordinate, work under pressure, and solve problems [1]. Likewise, Trolian mentions that the frequency of student-teacher interaction is positively related to students' attitudes towards professional success [149].
The seventh research area corresponds to cluster 7 (orange); it is composed of 10 nodes and acquires the name of 'Employability', as it is the term with the highest occurrence. Thus, it is manifested that the employability skills profile (ESP) includes personal management, academic, and teamwork, which could increase the probability of professional success [150]. Likewise, the link between graduates' perceptions of their employability and professional success is evaluated [21]. Perceived employability is considered the variable that can measure the link between individual protein professional attitude, organizational learning practices, and professional success [151].
The eighth research area corresponds to cluster 8 (brown), made up of 8 nodes, called 'Career Development'. With accelerated economic, social, and technological changes, social skills are considered an absolute necessity to achieve a successful career [152]. Academics determined that graduates' employability and professional development are the characteristics that limit professional success [153].

Cited authors Co-Citation Network
This bibliometric analysis facilitates the structuring of a research field, resulting in more active study areas and emerging trends [50,154,155]. The analysis emphasizes the most prominent authors in this line of professional success research, and they are related through citation records [53,60]. The proposed bibliometric network construction was carried out with VOSviewer, using a similarity measure called association strength to analyse the co-citation data [78]. The professional success information base has 55,015 cited authors, of which 814 presented at least 20 citations. After cleaning the data, 764 were obtained with at least 20 citations. Table 5 includes the 15 authors with the highest number of citations, and Figure 6 shows the author's co-citations map, which contains 6 clusters, 764 nodes, 174,073 links, and a total link strength of 1,556,004.   208), is related to 727 authors and Bandura, A. (193) which is related to 717 authors. In this cluster, according to Judge, he suggested that demographic, human capital, motivational, and organizational variables exhibit a notable change in objective professional success and professional satisfaction [83]. Subsequently, Judge also analysed the relationship between general mental ability (GMA) and extrinsic career success. As a result, people with high GMA had greater growth in extrinsic success because they achieved more education, job training and moved to more challenging jobs [156].
Cluster 2 (green), 'Proactive Personality and Career Success', comprises 175 authors, led by Crant, J.M. (249), which is related to 741 authors; Spurk, D. (226), who relates to 722 authors and Van Der Heijden, B.I.J.M. (202) who is related to 622 authors. Seibert's study stands out in this class, where a model was developed that relates proactive personality and professional success through four behavioural and cognitive mediators [87]. On the other hand, Abele suggested that professional success valued as objective professional achievements is indirectly positively related to life satisfaction, which is regularized by various subjective evaluations of success [128]. Finally, Van der Heijden admitted an employability model that optimizes career success in two age groups: for young people, employability ratings are related to objective career success outcomes. In people over 40 years of age, self-rated employability was positively related to promotions throughout professional life [157].  [158]. On the other hand, Bretz raised the theory of work adjustment (TWA) that relates to the person-environment adaptation and the satisfaction regarding the permanence in work [132]. Finally, Fuller extended previous career success models to include five-factor personality model traits and various extrinsic and intrinsic career success dimensions [89]. Hall's research excels, examining the experiences of high-level professionals who, by reducing their workload, could achieve more favourable professional and family outcomes [159]. Finally, Beigi contributes to the work-family literature through the study of the work-family interface (WFI) around professional success [160].
Cluster 5 (purple), 'Mentoring in Career Success', comprises 94 authors, led by Eby, L.T. (608), which is related to 761 authors; Kraimer, M.L. (575), which is also related to 761 authors and Seibert, S.E. (473) related to 761 authors. In this cluster, Eby evaluated three career success criteria (perceived job satisfaction, perceived internal marketability, and perceived external marketability) considered as predictors of career success [131]. The short-term benefits of mentoring were explored (better job performance, recognition from others, rewarding experience, and loyal support base), announcing the long-term results of the mentor's career success, work attitudes, and behavioural intentions for the future mentor [161].
Cluster 6 (light blue), 'Work Effectiveness', comprises 40 authors, led by Ferris, G.R. (361), which is related to 665 authors; Perrewé, P.L. (118), which is related to 590 authors and Pfeffer, J. (104) related to 642 authors. In this class, an investigation by Jawahar stands out, which analysed data obtained from supervisors of professional employees to demonstrate the influence of task and contextual performance on work promotion judgments [162]. According to Perrewé, there is still evidence of unfair treatment in organizations based on the female gender, which is why the implications for stress and wellbeing at work were discussed, and ways of dealing with the deficiency of political skills in women were proposed [163].

Scientific Cited Sources Co-Citation Network
This type of analysis allows for the understanding of the field of study's structure by observing the related study areas according to the number of citations shared in the reference journals [164,165]. In the formation of this network, 345 sources were considered, which had at least 20 citations. The 15 main journals considered by their highest number of citations are observed in Table 6. In Figure 7, the cited sources co-citation network is shown, composed of five clusters (groups of journals) and 345 nodes (journals), which are distinguished by colour, showing 19,558 relationships between journals (links) and a total link strength out of 672,588.

Discussion
For more than 150 years, issues related to professional success have been partially studied. However, for this analysis, we have considered articles from 1990 in which a formal definition of this topic is already included [4] and its progressive evolution until 2020. To know future trends in professional success, it was observed that the most relevant studies in the period 1991-2000 had addressed the five major personality traits [64], the predictors of professional success [84], and the influence of political behaviour on the professional success [7], among others. Later, the second period (2001-2010) focused on the theory of professional success [64], employability [90,91], personality effects to achieve professional success [90], objective and subjective professional success [97,125,[166][167][168], gender, and mentoring in career success [169][170][171][172]. Finally, in the period (2011-2020), gender [23,173], benefits of mentoring [114,174], and factors that determine professional success [175,176] were mainly studied.
Seventy-six countries contribute to this field of study, with the United States, the United Kingdom, and Canada standing out, with more than 60 publications. The United States has three authors from the top 15 of the most cited authors, who come from Fisher College of Business (Judge T.A.) and Rutgers University-New Brunswick (Kraimer M.L. and Seibert S.E). Regarding the most representative journals, two areas predominate management development and psychology. The intellectual structure of professional success has been analysed under three parameters of the science mapping section. In the first place, the analysis of co-occurrence according to author keywords, represented in (Figure 5), where it is observed that the most relevant term is 'Career Success', with 276 co-occurrences in the database. In addition, it is related to 71 of the 92 terms analysed. It is worth mentioning that this term has a strong link with 'Career' (Cluster 1), 'Gender' (Cluster 2), and 'Career Development' (Cluster 8) mainly.
Second, the co-citation cited authors (see Figure 6)

Conclusions
This study provides a bibliometric study of scientific articles related to professional success, which have been indexed in the Scopus database from 1991 to 2020. The analysis of scientific production shows the exponential growth in publications on this subject (see Interest in this topic is evident in the last three years since it went from 106 articles in 2018 to 126 articles in 2019 and 2020. Delimiting the largest scientific production in North America, Europe, and Oceania (see Figure 4), which agrees with the analysis of bibliographic coupling by countries (Figure 3), the following countries stand out: the United States, the United Kingdom, and Canada, with 601, 133, and 93 articles, respectively.
The spatial distribution of publications on professional success is directly related to the most cited documents. In the first place, there is the publication of the author Seibert S.E. [5], which reached 1221 citations and was published jointly with Kraimer M.L., Liden R.C. The second most cited publication was that of Judge T.A. [64] and reached 1062 citations. Finally, the third most cited document was also the author Judge T.A. [83], which reached 766 citations. This type of analysis allows for the understanding of the field of study's structure by observing the related study areas according to the number of citations shared in the reference journals. This article facilitates the understanding of professional success's intellectual structure, considering the scientific production, geographical distribution, and contribution of the most cited journals, authors, and documents. In this sense, 1369 articles, 76 countries, 691 journals, and 3106 authors have been evaluated.
Considering the results that intervene in the analysis by science mapping. In the first instance, the analysis of the co-occurrence network by author keywords, which is represented by eight clusters (research areas) and 92 nodes (topics), where the most relevant topic was 'Career Success', which coincides with the name of the research area (Cluster 3). The remaining research areas are related to: 'Career and Gender'; 'Objective and Subjective Career Success'; 'Emotional Intelligence'; 'Job Satisfaction'; 'Higher Education'; 'Employability'; and 'Career Development'.
Second, the network of co-citations, according to authors, is made up of six groups that represent the various issues related to professional success: 'Predictors of Career Success' (Cluster 1); 'Proactive Personality and Career Success' (Cluster 2); 'Career Management' (Cluster 3); 'New Directions in Career Theory' (Cluster 4); 'Mentoring in Career Success' (Cluster 5); and 'Work Effectiveness' (Cluster 6). The most representative author is Judge T.A., located in Cluster 1 and is related to 754 of the 762 items analysed.
Third, the network of co-citations by scientific journals includes five clusters, which show the fields of knowledge that have been developed in the career success area: 'Sociohydrology and Professional Development' (Cluster 1); 'Interdisciplinary Relations and Social Psychology' (Cluster 2); 'Theory of Management and Organizational Behaviour' (Cluster 3); 'Psychology in the Labor Field' (Cluster 4); and 'Career Choice and Work Psychology' (Cluster 5). The most prominent journal in this area is the Journal of Vocational Behavior, which contains highly representative articles [5,88,130,177].
Regarding the methodological approach of this work, the following limitations are presented: (i) using a single database (Scopus), which, despite being a recognized and commonly used database in academia, may exclude some significant contributions in other databases (Web of Sciences and Dimensions, among others); in addition, (ii) that only articles were reviewed; and (iii) documents in English, which despite being one of the most used languages and important contributions on professional success, can be excluded. The bibliometric approach is reliable and has been used by researchers worldwide in several studies, including [178][179][180]. The study required the use of some descriptors related to career success to obtain adequate information regarding the subject studied. These descriptors were subjected to a triangular search (title-abstract-keywords), where the title of the document helps to recognize the central focus of the study and the importance that the authors give to the topic; this is complemented by the use of the abstract and keywords to broadening this approach, based on research related to the term.
Supplementary Materials: The following are available online at https://www.mdpi.com/article/10 .3390/su13094625/s1, Table S1: Results of the co-occurrence network of author keywords.  Acknowledgments: Thanks to CIPAT-ESPOL for the support and accompaniment in the development of this publication and specially to Eng. Lady Bravo-Montero for her collaboration and helpful spirit. The preparation of this study counted with the collaboration of various scientific research projects, such as the academic projects of the ESPOL University (Escuela Superior Politécnica del Litoral) with code no. CIPAT-01-2018 Registro del Patrimonio Geológico y Minero y su incidencia en la defensa y preservación de la geodiversidad en Ecuador" (Registry of Geological and Mining Heritage and its impact on the defense and preservation of geodiversity in Ecuador); and the support of NOVA Science Research Associates and the project of UTEQ "Prediction and assessment of the professional success of university graduates", with code 44.

Conflicts of Interest:
The authors declare no conflict of interest.