Não informado. (2014). Geological Survey Professional Paper. U.S. Geological Survey Professional Paper.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Geological Survey Professional Paper. Washington: U.S. Geological Survey Professional Paper, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Geological Survey Professional Paper. U.S. Geological Survey Professional Paper, 2014.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.