MATTHEWS, G V T; REVETT, D L. ’Nonsense’ orientation of Pintail, Wigeon and Mallard from Nacton, Suffolk. Wildfowl, [S. l.], p. 145–150, 1982. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154207. Acesso em: 16 dec. 2025.