Vega, F. J., Nyborg, T. G., Perrilliat, M. D. C., Montellano-Ballesteros, M., Cevallos-Ferriz, S. R. S., & Quiroz-Barroso, S. A. (2006). Studies on Mexican Paleontology. Springer Netherlands. https://doi.org/10.1007/1-4020-3985-9

Vega, Francisco J., Torrey G. Nyborg, Mara Del Carmen Perrilliat, Marisol Montellano-Ballesteros, Sergio R. S. Cevallos-Ferriz, and Sara A. Quiroz-Barroso. Studies on Mexican Paleontology. Dordrecht: Springer Netherlands, 2006. https://doi.org/10.1007/1-4020-3985-9.

Vega, Francisco J., et al. Studies on Mexican Paleontology. Springer Netherlands, 2006. https://doi.org/10.1007/1-4020-3985-9.