Lara-Hernández, Felipe A., et al. “A Dicephalic Western Dusky Rattlesnake, Crotalus Triseriatus (Squamata: Viperidae)”. 2020. Reptiles & Amphibians, vol. 27, no. 3, Dec. 2020, pp. 530-1, https://doi.org/10.17161/randa.v27i3.14913.