BLACK, Jeffrey M; REES, Eileen C. The structure and behaviour of the Whooper Swan population wintering at Caerlaverock, Dumfries and Galloway, Scotland: an introductory study. Wildfowl, [S. l.], v. 35, p. 21–36, 1984. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155059. Acesso em: 17 dec. 2025.