• [Wiki] http://en.wikipedia.org/wiki/Urocyon_cinereoargenteus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Urocyon_cinereoargenteus.
• [ADW] https://animaldiversity.org/accounts/Urocyon_cinereoargenteus/.
• [Gran2011] Grant, K. (2011). Hand-rearing of the gray fox (Urocyon cinereoargenteus). Wildlife Rehabilitation Bulletin, 29:19--32.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.