Helgen, Kristofer M.; Wilson, Don E. (2005). "A Systematic and Zoogeographic Overview of the Raccoons of Mexico and Central America". In Sánchez-Cordero, Víctor; Medellín, Rodrigo A. (eds.). Contribuciones mastozoológicas en homenaje a Bernardo Villa. Mexico City: Instituto de Ecología of the Universidad Nacional Autónoma de México. p. 230. ISBN978-970-32-2603-0. Retrieved 2008-08-09. (This source was used for the whole chapter about classification.)