Keller, S. A. C. (1986). Mount St. Helens, five years later. Eastern Washington University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeller, S. A. C. Mount St. Helens, Five Years Later. Cheney, Wash.: Eastern Washington University Press, 1986.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKeller, S. A. C. Mount St. Helens, Five Years Later. Eastern Washington University Press, 1986.
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