• [Wiki] http://en.wikipedia.org/wiki/Caprimulgus_europaeus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=80D4B0FE7FF1D735&sec=lifehistory.
• [BerrBibb1981] Berry, R. and Bibby, C. J. (1981). A breeding study of nightjars. Britisg Birds, 74(4):161--169.
• [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.