Amphibian information was obtained from the following sources:

-Alexander, Shauna. ?Scaphiopus couchii.? Animal Diversity Web. 15 Mar. 2007.

 

-The Audubon Society Field Guide to North American Reptiles and Amphibians, Chanticleer Press, Inc., New York, 1979.

 

-Axley, Elizabeth J. ?Bufo cognatus.? Animal Diversity Web. 15 Mar. 2007. 

 

-Brennan, Thomas C., et al. A Field Guide to Amphibians and Reptiles in Arizona. Phoenix: Arizona Game and Fish Department, 2006.

 

-?Lowland Leopard Frog.? Friends of Saguaro National Park. 17 Mar. 2007.

 

-Peterson, Roger, ed. Field Guide to Western Reptiles and Amphibians. Boston: Houghton Mifflin Company, 1985.

 

-Tennyson, Raven. ?Woodhouse?s Toad: Bufo woodhousii.? Desert USA Web. 17 Mar. 2007.

 

-Woodin, Bill. ?Sonoran Desert toad: Bufo alvarius.? ASDM Web. 16 Mar. 2007. 

 

-Amphibiaweb: http://www.amphibiaweb.org/

 

-Wikipedia: http://en.wikipedia.org/wiki/Main_Page

 

-2006 IUCN Red List of Threatened Species: http://www.iucnredlist.org/