SPRAY, C J; ATKINSON, N. Moult and dispersal of Mute Swans Cygnus olor in East Scotland: a preliminary analysis. Wildfowl, [S. l.], p. 325, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154957. Acesso em: 17 dec. 2025.