- [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.