Schemes including Crotalus atrox

• IUCN Red List of Threatened Species. Version 2012.1 Crotalus atrox
• The Reptile Database (Crotalus_atrox) Crotalus atrox
• IUCN Red List of Threatened Species. Version 2012.2 (64311) Crotalus atrox
• Norma 059, 2010 Crotalus atrox
• NatureServe Explorer: An online encyclopedia of life. Version 7.1 (ELEMENT_GLOBAL.2.101695) Crotalus atrox
• CONABIO (15843REPTIB501112) Crotalus atrox
• GBIF (2444356) Crotalus atrox