Mitchell, Carl, Kendrew Colhoun, Anthony D Fox, Larry Griffin, Colette Hall, Richard Hearn, Chas Holt, and Alyn Walsh. “Trends in Goose Numbers Wintering in Britain & Ireland, 1995 to 2008”. Ornis Svecica 20, no. 3–4 (October 1, 2010): 128–143. Accessed July 18, 2024. https://journals.lub.lu.se/os/article/view/22619.