Baptista, L.F., Trail, P.W., Horblit, H.M., Bonan, A., Boesman, P. & Garcia, E.F.J. (2019). Scaled Dove (Columbina squammata). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World
Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/54227 on 19 March 2019).
Karte: San Jose, 1 April 2007, adapted by Chumwa, 6 May 2008
[GFDL or CC-BY-SA-3.0], via Wikimedia Commons