Taxon - Links and literature
de Jong, Y.S.D.M. (ed.): Fauna Europaea 2.4 [http://www.faunaeur.org] [as Larus heuglini Bree, 1876]Data retrieved on: 9 March 2012
Gill F., Donsker D. & Rasmussen P. (eds): IOC World Bird List 11.1 [http://www.worldbirdnames.org/] [as Larus fuscus heuglini Bree, 1876]Data retrieved on: 22 April 2021
Clements, J. F.: eBird/Clements checklist of birds of the world 6.7, Cornell Lab of Ornithology [as Larus fuscus heuglini]Data retrieved on: 7 April 2013