Tobacco Root Geological Society. Field Conference, Berg, R. B., & Breuninger, R. (1987). Guidebook of the Helena area, west-central Montana. Montana Bureau of Mines and Geology, Montana College of Mineral Science and Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTobacco Root Geological Society. Field Conference, Richard B. Berg, और Ray Breuninger. Guidebook of the Helena Area, West-central Montana. Butte, Mont.: Montana Bureau of Mines and Geology, Montana College of Mineral Science and Technology, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTobacco Root Geological Society. Field Conference, et al. Guidebook of the Helena Area, West-central Montana. Montana Bureau of Mines and Geology, Montana College of Mineral Science and Technology, 1987.
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