HEWSTON, Nigel R. Progress in aviculture by the Wildfowl and Wetlands Trust during 1991. Wildfowl, [S. l.], v. 43, p. 241–242, 1992. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155348. Acesso em: 15 apr. 2026.