APA (7e ed.) Bronvermelding

Não informado. (1966). Abstracts of North American geology. U.S. Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Abstracts of North American Geology. Washington: U.S. Geological Survey, 1966.

MLA (8e ed.) Bronvermelding

Não informado. Abstracts of North American Geology. U.S. Geological Survey, 1966.

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