Não informado. (1977). Current problems in obstetrics and gynecology. Year Book Medical Publishers.
Chicago-Zitierstil (17. Ausg.)Não informado. Current Problems in Obstetrics and Gynecology. Chicago, Ill: Year Book Medical Publishers, 1977.
MLA-Zitierstil (8. Ausg.)Não informado. Current Problems in Obstetrics and Gynecology. Year Book Medical Publishers, 1977.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.