Não informado. (2008). State University of Iowa studies in natural history. State University of Iowa.
Lua i Stíl Chicago (17ú heag.)Não informado. State University of Iowa Studies in Natural History. Iowa City, Iowa: State University of Iowa, 2008.
Lua MLA (8ú heag.)Não informado. State University of Iowa Studies in Natural History. State University of Iowa, 2008.
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