Amphibians of Washington and Oregon. Nussbaum, R.A., Brodie, E.D. and R.M. Storm. Amphibians and reptiles of the Pacific Northwest. Orchard, S.A. 1984. An ecological review.
Species notes for reptiles.
In Wildlife habitat handbooks for the Southern Interior Ecoprovince. Species notes for amphibians. In Wildlife habitat handbooks for the Southern Interior Ecoprovince. Amphibian population declines in British Columbia. Orchard, S. and A.P. Harcombe.