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.




Jones, Lawrence L.C., William P. Leonard, and Deanna H. Olson, eds. 2005.
Amphibians of the Pacific Northwest
Seattle, WA: Seattle Audubon Society. 304 pp.




Nussbaum, Ronald A., Edmund D. Brodie, Jr., and Robert M. Storm. 1983.
Amphibians and Reptiles of the Pacific Northwest
Moscow, ID: University of Idaho Press. 332 pp.




St. John, Alan. 2002.
Reptiles of the Northwest: California to Alaska, Rockies to the Coast
Renton, WA: Lone Pine Publishing. 272 pp.