Não informado. (2008). The University of Iowa Studies in Natural History. University of Iowa.
Chicago-Zitierstil (17. Ausg.)Não informado. The University of Iowa Studies in Natural History. Iowa City, Iowa: University of Iowa, 2008.
MLA-Zitierstil (8. Ausg.)Não informado. The University of Iowa Studies in Natural History. University of Iowa, 2008.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.