Burger, J., Gochfeld, M. & Garcia, E.F.J. (2019). Mediterranean Gull (Larus
melanocephalus). 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/54000 on 19 February 2019).