APA (7th ed.) Citation

ScienceDirect (Online service), Gallo, R. C., & Jay, G. (1991). The Human retroviruses. Academic Press.

Chicago Style (17th ed.) Citation

ScienceDirect (Online service), Robert C. Gallo, and Gilbert Jay. The Human Retroviruses. San Diego: Academic Press, 1991.

MLA (9th ed.) Citation

ScienceDirect (Online service), et al. The Human Retroviruses. Academic Press, 1991.