Não informado. (1919). University of Iowa Studies in Natural History. University of Iowa.
Citace podle Chicago (17th ed.)Não informado. University of Iowa Studies in Natural History. Iowa City, Iowa: University of Iowa, 1919.
Citace podle MLA (8th ed.)Não informado. University of Iowa Studies in Natural History. University of Iowa, 1919.
Upozornění: Tyto citace jsou generovány automaticky. Nemusí být zcela správně podle citačních pravidel..