HARRISON, Jeffery; WARDELL, John. W.A.G.B.I. hand-reared Mallard in the cold spell of 1962-63. Wildfowl, [S. l.], v. 15, p. 5, 1964. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155190. Acesso em: 5 apr. 2026.