Não informado. (1977). Current problems in obstetrics and gynecology. Year Book Medical Publishers.
Chicago-viite (17. p.)Não informado. Current Problems in Obstetrics and Gynecology. Chicago, Ill: Year Book Medical Publishers, 1977.
MLA-viite (8. p.)Não informado. Current Problems in Obstetrics and Gynecology. Year Book Medical Publishers, 1977.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.