Carrasco, P. A., Harvey, M. B., & Saravia, A. M. (2009). The rare Andean pitviper Rhinocerophis jonathani (Serpentes: Viperidae: Crotalinae): redescription with comments on its systematics and biogeography. Zootaxa, 2283(1), 1–15. https://doi.org/10.11646/zootaxa.2283.1.1