APA (7e ed.) Bronvermelding

Não informado. (1973). People. International Planned Parenthood Federation.

Chicago (17e ed.) Bronvermelding

Não informado. People. London: International Planned Parenthood Federation, 1973.

MLA (8e ed.) Bronvermelding

Não informado. People. International Planned Parenthood Federation, 1973.

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