Não informado. (2007). Annual report of the Director to the Board of Trustees. Chicago Natural History Museum.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Annual Report of the Director to the Board of Trustees. Chicago, Ill: Chicago Natural History Museum, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Annual Report of the Director to the Board of Trustees. Chicago Natural History Museum, 2007.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.