SCOTT, D K. The behaviour of Bewick’s Swans at the Welney Wildfowl Refuge, Norfolk, and on the surrounding fens: a comparison. Wildfowl, [S. l.], p. 5–18, 1980. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154170. Acesso em: 17 dec. 2025.