• [Wiki] http://en.wikipedia.org/wiki/Ardea_purpurea.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Ardea_purpurea.
• [arkive] https://www.arkive.org/purple-heron/ardea-purpurea/.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=8D6CB009B4D20368&sec=lifehistory.
• [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.
• [Toml1975] Tomlinson, D. N. S. (1975). Studies of the purple heron, part 3: Egg and chick development. Ostrich, 46(2):157--165. doi:10.1080/00306525.1975.9639510.