Meik, J.M. et al. 2012. Shallow phylogeographic structure in the declining Mexican Lance-headed Rattlesnake, Crotalus polystictus (Serpentes: Viperidae). Phyllomedusa: Journal of Herpetology. 11, 1 (Jun. 2012), 3–11. DOI:https://doi.org/10.11606/issn.2316-9079.v11i1p3-11.