A. J. Barton, “A Statistical Study of Thamnophis brachystoma (Cope) with Comments on the Kinship of T. butleri (Cope)”, iguana, vol. 14, no. 3, pp. 191–192, Sep. 2007, Accessed: May 06, 2024. [Online]. Available: https://journals.ku.edu/iguana/article/view/17711