Martínez-Vilalta, A., Motis, A. & Kirwan, G.M. (2019). Black-crowned Night-heron (Nycticorax nycticorax). 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/52707 on 8 February 2019).