Não informado. (2008). State University of Iowa studies in natural history. State University of Iowa.
Čikaški stil citiranja (17. izdanje)Não informado. State University of Iowa Studies in Natural History. Iowa City, Iowa: State University of Iowa, 2008.
MLA način citiranja (8. izdanje)Não informado. State University of Iowa Studies in Natural History. State University of Iowa, 2008.
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