- [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.