Gaya APA

cs, R, A, H, M, M. (1997). The essentials of contraceptive technology: a handbook for clinic staff . Baltimore, USA: Johns Hopkins Population Information Program.

Gaya MLA

cs, Robert, A., Hatcher,, MD,, MPH,. "The essentials of contraceptive technology: a handbook for clinic staff". Baltimore, USA: Johns Hopkins Population Information Program, 1997. Text.