Não informado. (2008). State University of Iowa studies in natural history. State University of Iowa.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. State University of Iowa Studies in Natural History. Iowa City, Iowa: State University of Iowa, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. State University of Iowa Studies in Natural History. State University of Iowa, 2008.
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