MLA

Piot, Peter, Bila M Kapita, and Elizabeth N Ngugi. Aids In Africa : a Manual for Physicians. Geneva: WHO, 1993.

APA

Piot, P., Kapita, B. M, & Ngugi, E. N. (1993). AIDS in Africa : a manual for physicians. Geneva: WHO.

Chicago

Piot, Peter, Bila M Kapita, and Elizabeth N Ngugi. AIDS In Africa: A Manual for Physicians. Geneva: WHO, 1993.