Não informado. (1940). Water Resources Review. U.S. Department of the Interior, Geological Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Water Resources Review. Reston, Va: U.S. Department of the Interior, Geological Survey, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Water Resources Review. U.S. Department of the Interior, Geological Survey, 1940.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.