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.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tobacco Root Geological Society. Field Conference, Richard B. Berg, و 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.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Tobacco 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.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.