APA-referens (7:e uppl.)

Não informado. (1980). Postgraduate Obstetrics & Gynecology. Postgraduate Obstetrics & Gynecology.

Chicago-referens (17:e uppl.)

Não informado. Postgraduate Obstetrics & Gynecology. Philadelphia, Pa: Postgraduate Obstetrics & Gynecology, 1980.

MLA-referens (8:e uppl.)

Não informado. Postgraduate Obstetrics & Gynecology. Postgraduate Obstetrics & Gynecology, 1980.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.