APA (7th ed.) Citation

K, C., H, L., Y, G., L, H., JS, M., & GW, R. (2003). Emerging HIV-1 epidemic in China in men who have sex with men. Lancet, 361(9375), 2125. https://doi.org/10.1016/s0140-6736(03)13690-2

Chicago Style (17th ed.) Citation

K, Choi, Liu H, Guo Y, Han L, Mandel JS, and Rutherford GW. "Emerging HIV-1 Epidemic in China in Men Who Have Sex with Men." Lancet 361, no. 9375 (2003): 2125. https://doi.org/10.1016/s0140-6736(03)13690-2.

MLA (9th ed.) Citation

K, Choi, et al. "Emerging HIV-1 Epidemic in China in Men Who Have Sex with Men." Lancet, vol. 361, no. 9375, 2003, p. 2125, https://doi.org/10.1016/s0140-6736(03)13690-2.