- [Wiki]
http://en.wikipedia.org/wiki/Centrochelys_sulcata.
- [ADW]
https://animaldiversity.org/accounts/Geochelone_sulcata/.
- [AnAge]
http://genomics.senescence.info/species/entry.php?species=Centrochelys_sulcata.
- [Kooy2010]
Kooijman, S. (2010).
Dynamic Energy Budget theory for metabolic organisation.
Cambridge Univ. Press, Cambridge.
- [RitzGrieb2010]
Ritz, J., Griebeler, E. M., Huber, R., and Clauss, M. (2010).
Body size development of captive and free-ranging African spurred
tortoises (Geochelone sulcata): high plasticity in reptilian growth
rates.
Herpetological Journal, 20:213--216.