Barton, A. J. “A Statistical Study of Thamnophis Brachystoma (Cope) With Comments on the Kinship of T. Butleri (Cope)”. Iguana 14, no. 3 (September 1, 2007): 191–192. Accessed July 22, 2024. https://journals.ku.edu/iguana/article/view/17711.