Não informado. (1999). Missouri bureau of geology and mines. Tribune Printing.
Chicagoスタイル(17版)引用形式Não informado. Missouri Bureau of Geology and Mines. Jefferson City, Mo: Tribune Printing, 1999.
MLA(8版)引用形式Não informado. Missouri Bureau of Geology and Mines. Tribune Printing, 1999.
警告: この引用は必ずしも正確ではありません.