Koch, Edward D., and Charles R. Peterson. 1995.
Amphibians and Reptiles of Yellowstone and Grand Teton National Parks
Salt Lake City, UT: University of Utah Press. 188 pp.




Werner, J. Kirwin, Bryce A. Maxell, Paula Hendricks, and Dennis L. Flath. 2004.
Amphibians and Reptiles of Montana
Missoula, MT: Mountain Press Publishing Company. 268 pp.