Hughes, B, J Kirby, and J M Rowcliffe. “Waterbird Conflicts in Britain and Ireland: Ruddy Ducks Oxyura Jamaicensis, Canada Geese Branta Canadensis, and Cormorants Phalacrocorax Carbo”. Wildfowl (January 1, 1999): 77–99. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/154581.