APA (7e ed.) Bronvermelding

Não informado. (1948). Mineral Information Service. California Division of Mines and Geology.

Chicago (17e ed.) Bronvermelding

Não informado. Mineral Information Service. Sacramento, Calif: California Division of Mines and Geology, 1948.

MLA (8e ed.) Bronvermelding

Não informado. Mineral Information Service. California Division of Mines and Geology, 1948.

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