Crotalus willardi obscurus
Painter, C. 1998. Status of New Mexico Ridgenose Rattlesnake. Performance report to U.S. Fish and Wildlife Service, Section 6 E-23-6. New Mexico Department of Game and Fish, 20 p.
Painter, C. 2000. Status of New Mexico Ridgenose Rattlesnake. Performance report to U.S. Fish and Wildlife Service, Section 6 E-23-8. New Mexico Department of Game and Fish, 123 p.
Painter, C. and L. Pierce. 2001. New Mexico amphibian and reptile GIS coverages. 123 p.
Painter, C. 1997. Status of New Mexico Ridgenose Rattlesnake. Performance report to U.S. Fish and Wildlife Service, Section 6 E-23-5. New Mexico Department of Game and Fish, 51 p.
Painter, C. 2012. Conservation of endangered, threatened, and sensitive amphibians and reptiles. Performance report to U.S. Fish and Wildlife Report, Section 6 E-61-5. 58p.
Painter, C. 2008. Conservation of endangered, threatened, and sensitive amphibians and reptiles. Performance report to U.S. Fish and Wildlife Report, Section 6 E-61-2. 68p.
Greenwalt, L. 1978. Rules and regulations. Federal Register. vol.43, NO. 151-Friday, August 4, 1978.
Holycross, A.T. 1995. Biogeography of Crotalus willardi in the Madrean Archipelago of Arizona. Unpubl. Quarterly Progress Report. Heritage IIPAM Grants-in-Aid Award I95048, p. 5.
U.S. Fish and Wildlife Service. 2005. The continued implementation of the land resource management plans for the eleven National Forests and National Grasslands of the Southwestern Region. Regional Office, Region 2 U.S. FWS, Albuquerque, NM. Cons. #2-22-0
Barker, D.G. 1991. An investigation of the natural history of the New Mexico ridgenose rattlesnake, Crotalus willardi obscurus. 100 p.