• [Wiki] http://en.wikipedia.org/wiki/Spermophilus_citellus.
• [ADW] https://animaldiversity.org/accounts/Spermophilus_citellus/.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Spermophilus_citellus.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [MillStri1999] Millesi, E., Strijkstra, A. M., Hoffmann, I. E., Dittami, J. P., and Daan, S. (1999). Sex and age differences in mass, morphology, and annual cycle in european ground squirrels, Spermophilus citellus. Journal of Mammalogy, 80(1):218--231.