APA (7e ed.) Bronvermelding

Não informado. (1882). Mineral resources of the United States. U.S. Geological Survey.

Chicago (17e ed.) Bronvermelding

Não informado. Mineral Resources of the United States. Washington: U.S. Geological Survey, 1882.

MLA (8e ed.) Bronvermelding

Não informado. Mineral Resources of the United States. U.S. Geological Survey, 1882.

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