Campbell, N. P. (1978). Caves of Montana. Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology.
Cita Chicago Style (17a ed.)Campbell, Newell P. Caves of Montana. Butte: Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology, 1978.
Cita MLA (8a ed.)Campbell, Newell P. Caves of Montana. Montana College of Mineral Science and Technology : for sale by Montana Bureau of Mines and Geology, 1978.
Precaución: Estas citas no son 100% exactas.