Não informado. (1955). Information circular. Wisconsin Geological and Natural History Survey.
Style de citation Chicago (17e éd.)Não informado. Information Circular. Madison, Wis: Wisconsin Geological and Natural History Survey, 1955.
Style de citation MLA (8e éd.)Não informado. Information Circular. Wisconsin Geological and Natural History Survey, 1955.
Attention : ces citations peuvent ne pas être correctes à 100%.