• [Wiki] http://en.wikipedia.org/wiki/Zosterops_virens.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=7475B40D0C3310F0&sec=lifehistory.
• [BroeWint1968] Broekhuysen, G. J. and Winterbottom, J. M. (1968). Breeding activity of the cape white-eye Zosterops virens capensis Sundevall in the South-West Cape. Ostrich, 39(3):163–176. doi:10.1080/00306525.1968.9634294.
• [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.