| Ref ID | Type | Author | Date | Title |
|
12179
| Journal Article | Livo, L.J., G.A. Hammerson, and H.M. Smith | 1998 | Summary of Amphibians and Reptiles Introduced into Colorado. |
|
13272
| Book | Stebbins, R.C. | 1985 | A field guide to western reptiles and ampbibians. Peterson Field Guide series |
