Werman, Steven D., Brian I. Crother, and Mary E. White. “PHYLOGENY OF SOME MIDDLE AMERICAN PITVIPERS BASED ON A CLADISTIC ANALYSIS OF MITOCHONDRIAL 12S AND 16S DNA SEQUENCE INFORMATION”. Contemporary Herpetology, no. 1 (June 8, 1999): 1–13. Accessed April 11, 2025. https://journals.ku.edu/ch/article/view/11949.