PERRY, Matthew C; WILLIAMS, Byron K; OBRECHT, Holliday H, III. Behaviour of captive Canvasbacks Aythya valisineria fed different diets during winter. Wildfowl, [S. l.], p. 80–87, 1989. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154013. Acesso em: 17 dec. 2025.