The discovery of HIV as the cause of AIDS.

MLA

Gallo, Robert C., and Luc Montagnier. “The Discovery of HIV as the Cause of AIDS.” The New England Journal of Medicine, vol. 349, no. 24, Dec. 2003, pp. 2283–85. EBSCOhost, https://doi.org/10.1056/NEJMp038194.

APA

Gallo, R. C., & Montagnier, L. (2003). The discovery of HIV as the cause of AIDS. The New England Journal of Medicine, 349(24), 2283–2285. https://doi.org/10.1056/NEJMp038194

Chicago

Gallo, Robert C, and Luc Montagnier. 2003. “The Discovery of HIV as the Cause of AIDS.” The New England Journal of Medicine 349 (24): 2283–85. doi:10.1056/NEJMp038194.