• [Wiki] http://en.wikipedia.org/wiki/Emberizoides_ypiranganus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=26E82632556F6CCD&sec=lifehistory.
• [ChiaFont2015] Chiarani, E. and Fontana, C. S. (2015). Breeding biology of the lesser grass-finch (Emberizoides ypiranganus) in southern Brazilian upland grasslands. The Wilson Journal of Ornithology, 127(3):441–456. doi:10.1676/14-137.1.
• [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.