Pierce, R.J. & Kirwan, G.M. (2019). Pied Avocet (Recurvirostra avosetta). 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/53762 on 8
February 2019).