APA (7e ed.) Bronvermelding

Não informado. (2001). Statistical digest. U.S. Fish and Wildlife Service.

Chicago (17e ed.) Bronvermelding

Não informado. Statistical Digest. Washington: U.S. Fish and Wildlife Service, 2001.

MLA (8e ed.) Bronvermelding

Não informado. Statistical Digest. U.S. Fish and Wildlife Service, 2001.

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