Não informado. (1894). Bulletin. South Dakota Geological and Natural History Survey.
Chicagoスタイル(17版)引用形式Não informado. Bulletin. Vermillion, SD: South Dakota Geological and Natural History Survey, 1894.
MLA(8版)引用形式Não informado. Bulletin. South Dakota Geological and Natural History Survey, 1894.
警告: この引用は必ずしも正確ではありません.