1. Dyhouse, C. (2011). Skin deep: The fall of fur. History Today, 61(11).
2. Harris, S., & Yalden, D. (2008). Mammals of the British isles (4th Revised ed.). Southampton: Mammal Society.
3. Spagnesi, M., Toso, S., & De Marinins, A. M. (2002). Mammafen d’Italia Ministero dell’Ambiente e della Tutela del Territorio e Istituto Nazionale per la Fauna Selvatica, Italy.
4. Seton, E. T. (1909). Life-histories of northern animals: An account of the mammals of Manitoba. New York: Scribner.
5. Kurtén, B. (1980). Pleistocene mammals in North America. Columbia University Press: New York.