RICHARDSON, Tony; BROWN, Martin. Progress in Aviculture by The Wildfowl & Wetlands Trust (WWT) during 1994. Wildfowl, [S. l.], p. 187–190, 1995. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154657. Acesso em: 16 dec. 2025.