• [Wiki] http://en.wikipedia.org/wiki/Poicephalus_robustus.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Poicephalus_robustus.
• [EoL] http://eol.org/pages/1177918/details.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PrinPres1991] Prinzinger, R., A.Preßmar, and Schleucher, E. (1991). Body temperature in birds. Comp. Biochem. Physiol., 99A(4):499--506. doi:10.1016/0300-9629(91)90122-S.
• [SymeBrow2004] Symes, C., Brown, M., Warburton, L., Perrin, M., and Downs, C. (2004). Observations of Cape parrot, Poicephalus robustus, nesting in the wild. Ostrich, 75:106--109. doi:10.2989/00306520409485421.