Kalejta-Summers, Bozena. “Long-Term Changes in Numbers and Distribution of Wintering Ducks and Swans in the Moray Firth, Scotland, 1985-2002”. Wildfowl (April 16, 2013): 94–112. Accessed December 17, 2025. https://tidsskrift.dk/Wildfowl/article/view/153981.