Williams, H. (1941). Crater lake: The story of its origin. University of California Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Howel. Crater Lake: The Story of Its Origin. Berkeley, Los Angeles: University of California Press, 1941.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Howel. Crater Lake: The Story of Its Origin. University of California Press, 1941.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.