Gaya APA

[et.al], R, A, ,, R, B. (1997). the Essentials of contraceptive technology: a handbook for clinic staff . Baltimore: Population Information program.

Gaya MLA

[et.al], Robert, A.Hatcher,M.D.,M.P.H, ,Ward, Rinehart,Richard, Blackburn. "the Essentials of contraceptive technology: a handbook for clinic staff". Baltimore: Population Information program, 1997. Text.