Winkler, H. & Christie, D.A. (2017). Ashy Woodpecker (Mulleripicus fulvus). 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 http://www.hbw.com/node/56334 on 4 March 2017)
