Snell, R. R., P. Pyle, and M. A. Patten (2020). Iceland Gull (Larus glaucoides), version 1.0. In Birds of the World (P. G. Rodewald and B. K. Keeney, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.y00478.01
hbw.com
Burger, J., Gochfeld, M. & Garcia, E.F.J. (2018). Iceland Gull (Larus glaucoides). 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/53980 on 15 July 2018).