Sources Used

Behler, John L. and F. Wayne King.
National Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knofpf, New York. 1996

Conant, Roger and Jospeh T. Collins.
Peterson Field Guides Reptiles and Amphibians: Eastern/Central North America. Houghton Mifflin Company, Boston. 1991