Campbell, N. P. (1978). Caves of Montana. Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCampbell, Newell P. Caves of Montana. Butte: Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology, 1978.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCampbell, Newell P. Caves of Montana. Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology, 1978.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.