• [Wiki] http://en.wikipedia.org/wiki/Thamnophis_sirtalis.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Thamnophis_sirtalis.
• [ADW] https://animaldiversity.org/accounts/Thamnophis_sirtalis/.
• [Carp1952] Carpenter, C. C. (1952). Growth and maturity of the three species of Thamnophis in Michigan. Copeia, 1952(4):237--243.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.