Alt, D. D. (1984). Profiles of Montana geology: A layman's guide to the Treasure State. Montana Bureau of Mines and Geology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAlt, David D. Profiles of Montana Geology: A Layman's Guide to the Treasure State. Butte, Mont.: Montana Bureau of Mines and Geology, 1984.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAlt, David D. Profiles of Montana Geology: A Layman's Guide to the Treasure State. Montana Bureau of Mines and Geology, 1984.
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