APA (7e ed.) Bronvermelding

Não informado. (1968). IBP inter-american news. National Committee, International Biological Programme.

Chicago (17e ed.) Bronvermelding

Não informado. IBP Inter-american News. Washington: National Committee, International Biological Programme, 1968.

MLA (8e ed.) Bronvermelding

Não informado. IBP Inter-american News. National Committee, International Biological Programme, 1968.

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