WRIGHT, Gordon; BOYD, Hugh. Numbers, age and sex of Greylag and Pink-footed Geese shot at Loch Leven National Nature Reserve, 1966-1981. Wildfowl, [S. l.], p. 163–170, 1983. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154234. Acesso em: 17 dec. 2025.