WARD, Robin M; CRANSWICK, Peter A; KERSHAW, Melanie; AUSTIN, Graham E; BROWN, Allan W; BROWN, Lyndesay M; COLEMAN, Jon C; CHISHOLM, Helen C; SPRAY, Chris J. Numbers of Mute Swans Cygnus olor in Great Britain: results of the national census in 2002. Wildfowl, [S. l.], p. 3–20, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/153878. Acesso em: 16 dec. 2025.