Auffenberg, Walter, and Rehman Hafeezur. “Studies on Pakistan Reptiles Pt. 1. The Genus Echis (Viperidae)”. Bulletin of the Florida Museum of Natural History 35, no. 5 (March 20, 1991): 263–314. Accessed May 7, 2026. https://flmnhbulletin.com/index.php/flmnh/article/view/flmnh-vol35-no5.