• [Wiki] http://en.wikipedia.org/wiki/Chelonoidis_nigra.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Geochelone_nigra.
• [iucn] http://www.iucnredlist.org/details/163449/0.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [RitzHamm2010] Ritz, J., Hammer, C., and Clauss, M. (2010). Body size development of captive and free-ranging leopard tortoises (Geochelone pardalis). Zoo Biology, 29:517--525.