• [Wiki] http://en.wikipedia.org/wiki/Sula_dactylatra.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Sula_dactylatra.
• [Dorw1962] Dorwad, D. F. (1962). Comparative biology of the white booby and the brown booby Sula spp. at Ascension. Ibis, 103B:174--220. doi:10.1111/j.1474-919X.1962.tb07244.x.
• [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.