Gaya APA

[at.a], W, R., Robert, A, H. (1997). The Essentials of Contraceptive Technology A handbook for Clinic Staff . : Population Information Program Center for Communication Program.

Gaya MLA

[at.a], Ward, Rinehart., Robert, A., Hatcher,. "The Essentials of Contraceptive Technology A handbook for Clinic Staff". : Population Information Program Center for Communication Program, 1997. Teks.