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