Baxter,
George T., and Michael D. Stone. 1985. Amphibians
and Reptiles of Wyoming
2d ed. Cheyenne: Wyoming Game and Fish Department. 137 pp.
Cerovski,
Andrea O., Martin Grenier, Bob Oakleaf, Laurie Van Fleet, and Susan
Patla. 1994.
Atlas of Birds, Mammals, Amphibians,
and Reptiles in Wyoming
Lander: Wyoming Game and Fish Department. 206 pp.
[also available online here]

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.

Parker,
Joshua, and Stanley Anderson. 2001.
Identification Guide to the Herptiles
of Wyoming
Laramie: Wyoming Cooperative Fish and Wildlife Research Unit. 40 pp.