Não informado. (1919). University of Iowa Studies in Natural History. University of Iowa.
Style de citation Chicago (17e éd.)Não informado. University of Iowa Studies in Natural History. Iowa City, Iowa: University of Iowa, 1919.
Style de citation MLA (8e éd.)Não informado. University of Iowa Studies in Natural History. University of Iowa, 1919.
Attention : ces citations peuvent ne pas être correctes à 100%.