APA (7e ed.) Bronvermelding

Não informado. (1947). Information Circular. State of California, Department of Natural Resources, Division of Mines.

Chicago (17e ed.) Bronvermelding

Não informado. Information Circular. San Francisco, Calif: State of California, Department of Natural Resources, Division of Mines, 1947.

MLA (8e ed.) Bronvermelding

Não informado. Information Circular. State of California, Department of Natural Resources, Division of Mines, 1947.

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