APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (8e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.