Não informado. (1914). Bulletin of the Minnesota Geological Survey. University of Minnesota.
Chicagoスタイル(17版)引用形式Não informado. Bulletin of the Minnesota Geological Survey. Minneapolis, Minn: University of Minnesota, 1914.
MLA(8版)引用形式Não informado. Bulletin of the Minnesota Geological Survey. University of Minnesota, 1914.
警告: この引用は必ずしも正確ではありません.