Não informado. (1914). Bulletin of the Minnesota Geological Survey. University of Minnesota.
Style de citation Chicago (17e éd.)Não informado. Bulletin of the Minnesota Geological Survey. Minneapolis, Minn: University of Minnesota, 1914.
Style de citation MLA (8e éd.)Não informado. Bulletin of the Minnesota Geological Survey. University of Minnesota, 1914.
Attention : ces citations peuvent ne pas être correctes à 100%.