Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains

by Henry S. Fitch; T. Paul Maslin

1946. The identity of certain specific names in Thamnophis. Herpetologica, 3:71-72.

Smith, H. M., and Taylor, E. H.

1945. An annotated check list and key to the snakes of Mexico. Bull. U. S. Nat. Mus., 187, 239 pp.

Stebbins, R. C.

1954. Amphibians and reptiles of western North America. McGraw-Hill Book Co., Inc., xxiv + 528 pp.

Van Denburgh, J.

1924. Notes on the herpetology of New Mexico, with a list of the species known from the state. Proc. California Acad. Sci., 4th ser., 13(12):189-250.

Van Denburgh, J., and Slevin, J.

1918. The garter-snakes of Western North America. Proc. California Acad. Sci., 4th ser., 8:181-270.