APA (7e ed.) Bronvermelding

Não informado. (1959). International Zoo Yearbook. Zoological Society of London.

Chicago (17e ed.) Bronvermelding

Não informado. International Zoo Yearbook. London: Zoological Society of London, 1959.

MLA (8e ed.) Bronvermelding

Não informado. International Zoo Yearbook. Zoological Society of London, 1959.

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