Não informado. (2018). Report on the Illinois State Museum of Natural History. Phillips Bros., State Printers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Report on the Illinois State Museum of Natural History. Springfield, Ill: Phillips Bros., State Printers, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Report on the Illinois State Museum of Natural History. Phillips Bros., State Printers, 2018.
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