Literature
, 2015. Birds of Conservation Concern 4: the population status of birds in the UK, Channel Islands and Isle of Man. , 108, pp.708 - 746. Available at: https://www.researchgate.net/publication/286883061_Birds_of_Conservation_Concern_4_the_population_status_of_birds_in_the_UK_Channel_Islands_and_Isle_of_Man.