Ryu, J.;                     Yoon, Y.;                     Kim, H.;                     Kang, C.W.;                     Jung-Choi, K.    
        The Change of Self-Rated Health According to Working Hours for Two Years by Gender. Int. J. Environ. Res. Public Health 2018, 15, 1984.
    https://doi.org/10.3390/ijerph15091984
    AMA Style
    
                                Ryu J,                                 Yoon Y,                                 Kim H,                                 Kang CW,                                 Jung-Choi K.        
                The Change of Self-Rated Health According to Working Hours for Two Years by Gender. International Journal of Environmental Research and Public Health. 2018; 15(9):1984.
        https://doi.org/10.3390/ijerph15091984
    
    Chicago/Turabian Style
    
                                Ryu, Jia,                                 Yeogyeong Yoon,                                 Hyunjoo Kim,                                 Chung Won Kang,                                 and Kyunghee Jung-Choi.        
                2018. "The Change of Self-Rated Health According to Working Hours for Two Years by Gender" International Journal of Environmental Research and Public Health 15, no. 9: 1984.
        https://doi.org/10.3390/ijerph15091984
    
    APA Style
    
                                Ryu, J.,                                 Yoon, Y.,                                 Kim, H.,                                 Kang, C. W.,                                 & Jung-Choi, K.        
        
        (2018). The Change of Self-Rated Health According to Working Hours for Two Years by Gender. International Journal of Environmental Research and Public Health, 15(9), 1984.
        https://doi.org/10.3390/ijerph15091984