SALMON, D G; KIRBY, J S. Wildfowl counts in the U.K., 1988-89. Wildfowl, [S. l.], v. 41, p. 139–141, 1990. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154034. Acesso em: 15 apr. 2026.