1900. The crocodilians, lizards, and snakes of North America. U. S. Nat. Mus. Rept. (1898), 153-1270.

Dowling, H. G.

1951. A proposed standard system of counting ventrals in snakes. British J. Herpetology, 1(5):97-99.

1957. A review of the amphibians and reptiles of Arkansas. Occas. Paps. Univ. Arkansas Mus., No. 3:1-51.

Dunn, E. R.

1928. A tentative key and arrangement of the American genera of Colubridae. Bull. Antivenin Inst. Amer., 2 (147):18-24.

Force, E. R.

1935. A local study of the opisthoglyph snake Tantilla gracilis Baird and Girard. Papers Michigan Acad. Sci., Arts and Letters, 20:645-659.

Kirn, A. J., Burger, W. L., and Smith, H. M.

1949. The subspecies of Tantilla gracilis. Amer. Midl. Nat., 42(1):238-251.

Peters, J. A.