APA (7th ed.) Citation

PD, Z., & ME, E. (1998). HIV in the elderly. AIDS patient care and STDs, 12(4), 255. https://doi.org/10.1089/apc.1998.12.255

Chicago Style (17th ed.) Citation

PD, Zelenetz, and Epstein ME. "HIV in the Elderly." AIDS Patient Care and STDs 12, no. 4 (1998): 255. https://doi.org/10.1089/apc.1998.12.255.

MLA (9th ed.) Citation

PD, Zelenetz, and Epstein ME. "HIV in the Elderly." AIDS Patient Care and STDs, vol. 12, no. 4, 1998, p. 255, https://doi.org/10.1089/apc.1998.12.255.