Não informado. (1989). Current Opinion in Obstetrics and Gynecology. Rapid Science Publishers.
Chicago-referens (17:e uppl.)Não informado. Current Opinion in Obstetrics and Gynecology. London: Rapid Science Publishers, 1989.
MLA-referens (8:e uppl.)Não informado. Current Opinion in Obstetrics and Gynecology. Rapid Science Publishers, 1989.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.