Duan, Y.;                     Shi, J.;                     Wang, Z.;                     Zhou, S.;                     Jin, Y.;                     Zheng, Z.-J.    
        Disparities in COVID-19 Vaccination among Low-, Middle-, and High-Income Countries: The Mediating Role of Vaccination Policy. Vaccines 2021, 9, 905.
    https://doi.org/10.3390/vaccines9080905
    AMA Style
    
                                Duan Y,                                 Shi J,                                 Wang Z,                                 Zhou S,                                 Jin Y,                                 Zheng Z-J.        
                Disparities in COVID-19 Vaccination among Low-, Middle-, and High-Income Countries: The Mediating Role of Vaccination Policy. Vaccines. 2021; 9(8):905.
        https://doi.org/10.3390/vaccines9080905
    
    Chicago/Turabian Style
    
                                Duan, Yuqi,                                 Junyi Shi,                                 Zongbin Wang,                                 Shuduo Zhou,                                 Yinzi Jin,                                 and Zhi-Jie Zheng.        
                2021. "Disparities in COVID-19 Vaccination among Low-, Middle-, and High-Income Countries: The Mediating Role of Vaccination Policy" Vaccines 9, no. 8: 905.
        https://doi.org/10.3390/vaccines9080905
    
    APA Style
    
                                Duan, Y.,                                 Shi, J.,                                 Wang, Z.,                                 Zhou, S.,                                 Jin, Y.,                                 & Zheng, Z.-J.        
        
        (2021). Disparities in COVID-19 Vaccination among Low-, Middle-, and High-Income Countries: The Mediating Role of Vaccination Policy. Vaccines, 9(8), 905.
        https://doi.org/10.3390/vaccines9080905