MITCHELL, Carl; BOYD, Hugh; OWEN, Myrfyn; OGILVIE, Malcolm. Fifty years of goose research and conservation by The Wildfowl & Wetlands Trust. Wildfowl, [S. l.], p. 230–239, 1996. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154631. Acesso em: 16 dec. 2025.