Jadin, Robert C., et al. “Hemipenes of the Long-Tailed Rattlesnakes (Serpentes: Viperidae) from Mexico”. Phyllomedusa: Journal of Herpetology, vol. 9, no. 1, July 2010, pp. 69-73, https://doi.org/10.11606/issn.2316-9079.v9i1p69-73.