• [Wiki] http://en.wikipedia.org/wiki/Larus_delawarensis.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Larus_delawarensis.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=23863F65441680FA&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.
• [Verm1970] Vermeer, K. (1970). Breeding biology of california and ring-billed gulls a study of ecological adaptation to the inland habitat. Technical report, Dept. of Indian Affairs and Northern Development.