Macdonald, David W. (26 April 2010). "Food Caching by Red Foxes and Some Other Carnivores". Zeitschrift für Tierpsychologie. 42 (2): 170–185. doi:10.1111/j.1439-0310.1976.tb00963.x. PMID1007654.
Parkes, I. W. Rowlands and A. S. (21 August 2009). "The Reproductive Processes of certain Mammals.-VIII. Reproduction in Foxes (Vulpes spp.)". Proceedings of the Zoological Society of London. 105 (4): 823–841. doi:10.1111/j.1469-7998.1935.tb06267.x.
Hildebrand, Milton (1952). "The Integument in Canidae". Journal of Mammalogy. 33 (4): 419–428. doi:10.2307/1376014. JSTOR1376014.
Macdonald, David W. (26 April 2010). "Food Caching by Red Foxes and Some Other Carnivores". Zeitschrift für Tierpsychologie. 42 (2): 170–185. doi:10.1111/j.1439-0310.1976.tb00963.x. PMID1007654.