AUFFENBERG, Walter; HAFEEZUR, Rehman. Studies on Pakistan Reptiles Pt. 1. The Genus Echis (Viperidae). Bulletin of the Florida Museum of Natural History, [S. l.], v. 35, n. 5, p. 263–314, 1991. DOI: 10.58782/flmnh.jxkt5184. Disponível em: https://flmnhbulletin.com/index.php/flmnh/article/view/flmnh-vol35-no5. Acesso em: 7 may. 2026.