APA (7th ed.) Citation

Hartsock, P. (1991). Longitudinal studies of HIV infection in intravenous drug users: Methodological issues in natural history research. DHHS publication.

Chicago Style (17th ed.) Citation

Hartsock, Peter. "Longitudinal Studies of HIV Infection in Intravenous Drug Users: Methodological Issues in Natural History Research." DHHS Publication 1991.

MLA (9th ed.) Citation

Hartsock, Peter. "Longitudinal Studies of HIV Infection in Intravenous Drug Users: Methodological Issues in Natural History Research." DHHS Publication, 1991.

Warning: These citations may not always be 100% accurate.