Hatcher, R. A. (1997). The essentials of contraceptive technology. Population Information Program, Center for Communications Program, Johns Hopkins School of Public Health.
Chicago-referens (17:e uppl.)Hatcher, Robert A. The Essentials of Contraceptive Technology. Baltimore, MD: Population Information Program, Center for Communications Program, Johns Hopkins School of Public Health, 1997.
MLA-referens (9:e uppl.)Hatcher, Robert A. The Essentials of Contraceptive Technology. Population Information Program, Center for Communications Program, Johns Hopkins School of Public Health, 1997.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.