Não informado. (1964). Commodity Data Summaries. U.S. Department of the Interior, Bureau of Mines.
Style de citation Chicago (17e éd.)Não informado. Commodity Data Summaries. Washington: U.S. Department of the Interior, Bureau of Mines, 1964.
Style de citation MLA (8e éd.)Não informado. Commodity Data Summaries. U.S. Department of the Interior, Bureau of Mines, 1964.
Attention : ces citations peuvent ne pas être correctes à 100%.