Não informado. (1883). Bulletin of the United States Geological Survey. U.S. Department of the Interior.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the United States Geological Survey. Washington: U.S. Department of the Interior, 1883.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the United States Geological Survey. U.S. Department of the Interior, 1883.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.