• [Wiki] http://en.wikipedia.org/wiki/Sciurus_aberti.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Sciurus_carolinensis.
• [ADW] http://animaldiversity.org/accounts/Sciurus_aberti/.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.