Hallowell, 1856: Notes on Reptilia in the collection of the Museum of the Academy of Natural Sciences. Proceedings of the Academy of Natural Sciences of Philadelphia, vol.8, p.146-153 (texte intégral).
↑Hallowell, 1856: Notes on Reptilia in the collection of the Museum of the Academy of Natural Sciences. Proceedings of the Academy of Natural Sciences of Philadelphia, vol.8, p.151-152.