Não informado. (1976). Minerals & Materials. U.S. Department of the Interior, Bureau of Mines.
Style de citation Chicago (17e éd.)Não informado. Minerals & Materials. Washington: U.S. Department of the Interior, Bureau of Mines, 1976.
Style de citation MLA (8e éd.)Não informado. Minerals & Materials. U.S. Department of the Interior, Bureau of Mines, 1976.
Attention : ces citations peuvent ne pas être correctes à 100%.