• [Wiki] http://en.wikipedia.org/wiki/Vipera_aspis.
  • [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
  • [Naul1973] Naulleau, G. (1973). Rearing the asp viper Vipera aspis in captivity. International Zoo Yearbook, 13(1):108–111. doi:10.1111/j.1748-1090.1973.tb02115.x.