Não informado. (1999). Missouri bureau of geology and mines. Tribune Printing.
Style de citation Chicago (17e éd.)Não informado. Missouri Bureau of Geology and Mines. Jefferson City, Mo: Tribune Printing, 1999.
Style de citation MLA (8e éd.)Não informado. Missouri Bureau of Geology and Mines. Tribune Printing, 1999.
Attention : ces citations peuvent ne pas être correctes à 100%.