Korosec, M. A., Rigby, J. G., & Stoffel, K. L. (1980). The 1980 eruption of Mount St. Helens, Washington. Washington State Dept. of Natural Resources, Division of Geology and Earth Resources.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKorosec, M. A., James G. Rigby, और Keith L. Stoffel. The 1980 Eruption of Mount St. Helens, Washington. Olympia: Washington State Dept. of Natural Resources, Division of Geology and Earth Resources, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKorosec, M. A., et al. The 1980 Eruption of Mount St. Helens, Washington. Washington State Dept. of Natural Resources, Division of Geology and Earth Resources, 1980.
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