• [Wiki] http://en.wikipedia.org/wiki/Psittacula_krameri.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Psittacula_krameri.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=6B1CFC3CFA400D78&sec=lifehistory.
• [BrauWink2013] Braun, M. P. and Wink, M. (2013). Nestling development of ring-necked parakeets (Psittacula krameri) in a nest box population. The Open Ornithology Journal, 6:9--24. doi:10.2174/187445320130601000.
• [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.