• [Wiki] http://en.wikipedia.org/wiki/Merops_apiaster.
• [ADW] https://animaldiversity.org/accounts/Merops_apiaster/.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Merops_apiaster.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=66AA3934DBAD18BC&sec=lifehistory.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [LessAver1989] Lessells, C. M. and Avery, M. I. (1989). Hatching asynchrony in european bee-eaters Merops apiaster. Journal of Animal Ecology, 58(3):815--835.
• [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.