• [Wiki] http://en.wikipedia.org/wiki/Scopus_umbretta.
• [EoL] http://eol.org/pages/1049601/overview.
• [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.
• [WilsWils1988] Wilson, R. T., Wilson, M. P., and Durkin, J. W. (1988). Growth of nestling hamerkops Scopus umbretta in central Mali. Ibis, 130:384--392. doi:10.1111/j.1474-919X.1988.tb00996.x.