Hayward, A., Lorain, D., & Shangle, R. D. (1996). Volcano, Mount St. Helens: Before, during, after, May 18, 1980. American Products Co. ; Prime distributor, United Products Corp..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHayward, Al, Douglas Lorain, और Robert D. Shangle. Volcano, Mount St. Helens: Before, During, After, May 18, 1980. Portland, Or.: American Products Co. ; Prime distributor, United Products Corp., 1996.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHayward, Al, et al. Volcano, Mount St. Helens: Before, During, After, May 18, 1980. American Products Co. ; Prime distributor, United Products Corp., 1996.
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