• [Wiki] http://en.wikipedia.org/wiki/Panthera_tigris.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Panthera_tigris.
• [Hugh1977] Hughes, F. (1977). Hand-rearing a Sumatran tiger Panthera tigris sumatrae at Whipsnade Park. International Zoo Yearbook, 17:219--221. doi:10.1111/j.1748-1090.1977.tb00918.x.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.