APA (7e ed.) Bronvermelding

Não informado. (1956). Bulletin. International Union for Conservation of Nature and Natural Resources.

Chicago (17e ed.) Bronvermelding

Não informado. Bulletin. Brussels: International Union for Conservation of Nature and Natural Resources, 1956.

MLA (8e ed.) Bronvermelding

Não informado. Bulletin. International Union for Conservation of Nature and Natural Resources, 1956.

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