BOYD, H; OGILVIE, M A. Changes in the British-wintering population of the Pink-footed Goose from 1950 to 1975. Wildfowl, [S. l.], p. 33–46, 1969. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155572. Acesso em: 18 dec. 2025.