• [Wiki] http://en.wikipedia.org/wiki/Passerina_cyanea.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Passerina_cyanea.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=043F337AA25E7D97&sec=lifehistory.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [Morg1976] Morgan, F. D. (1976). Nesting studies of the indigo bunting (Passerina cyanea) at Thornhill, Indiana. Indiana Acad. Sci., 86:461--465.
• [Payn2020] Payne, R. B. (2020). Indigo bunting (Passerina cyanea), version 1.0. in birds of the world (a. f. poole, editor). cornell lab of ornithology, ithaca, ny, usa. doi:10.2173/bow.indbun.01.
• [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.