MIDDLETON, Beth A; VAN DER VALK, A. G. The food habits of Greylag and Barheaded Geese in the Keoladeo National Park, India. Wildfowl, [S. l.], p. 94–102, 1987. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154807. Acesso em: 17 dec. 2025.