APA (7e ed.) Bronvermelding

Não informado. (1964). Commodity Data Summaries. U.S. Department of the Interior, Bureau of Mines.

Chicago (17e ed.) Bronvermelding

Não informado. Commodity Data Summaries. Washington: U.S. Department of the Interior, Bureau of Mines, 1964.

MLA (8e ed.) Bronvermelding

Não informado. Commodity Data Summaries. U.S. Department of the Interior, Bureau of Mines, 1964.

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