• [Wiki] http://en.wikipedia.org/wiki/Geospiza_scandens.
• [EoL] http://eol.org/pages/1050335/details.
• [Boag1984] Boag, P. T. (1984). Growth and allometry of external morphology in Darwin's finches (Geospiza) on Isla Daphne Major, Galapagos. J. Zool., Lond., 204:413--441. doi:10.1111/j.1469-7998.1984.tb02380.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.