Não informado. (1977). Geoscience Wisconsin. Wisconsin Geological and Natural History Survey.
Style de citation Chicago (17e éd.)Não informado. Geoscience Wisconsin. Madison, Wis: Wisconsin Geological and Natural History Survey, 1977.
Style de citation MLA (8e éd.)Não informado. Geoscience Wisconsin. Wisconsin Geological and Natural History Survey, 1977.
Attention : ces citations peuvent ne pas être correctes à 100%.