RICHARDSON, Tony; BROWN, Martin. Progress in aviculture by The Wildfowl and Wetlands Trust (WWT) during 1992. Wildfowl, [S. l.], p. 211–213, 1993. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154680. Acesso em: 17 dec. 2025.