• [Wiki] http://en.wikipedia.org/wiki/Bubo_bubo.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=5516AEB347441B72&sec=lifehistory.
• [AnAge] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=C4D3F66E8E6D543F&sec=lifehistory.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PentDelg2004] Penteriani, V., Delgado, M. M., Maggio, C., Aradis, A., and Sergio, F. (2004). Development of chicks and predispersal behaviour of young in the eagle owl Bubo bubo. Ibis, 147(1):155–168. doi:10.1111/j.1474-919x.2004.00381.x.
• [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.