APA (7e ed.) Bronvermelding

Não informado. Mineral Facts and Problems. Bureau of Mines.

Chicago (17e ed.) Bronvermelding

Não informado. Mineral Facts and Problems. Washington: Bureau of Mines.

MLA (8e ed.) Bronvermelding

Não informado. Mineral Facts and Problems. Bureau of Mines.

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