Force, E. R.
1930. The amphibians and reptiles of Tulsa County, Oklahoma, and vicinity. Copeia, 1930(2):25-39.
Fouquette, M. J. and Lindsay, H. L., Jr.
1955. An ecological survey of reptiles in parts of northwestern Texas. The Texas Jour. Sci., 7(4):402-421.
Gloyd, H. K.
1928. The amphibians and reptiles of Franklin County, Kansas. Trans. Kansas Acad. Sci., 31:115-141.
1932. The herpetological fauna of the Pigeon Lake region, Miami County, Kansas. Papers Michigan Acad. Sci. Arts and Letters, 15:389-409.
1945. The problem of too many snakes. Chicago Nat., 7(4):87-97.
Grinnell, J., Dixon, J., and Linsdale, J. M.
1930. Vertebrate natural history of a section of northern California through the Lassen Peak region. Univ. Calif. Publ. Zool., 35: v + 594 pp., 181 figs.
Guidry, E. V.