JOHNSGARD, Paul A. Observations on the behaviour and relationships of the White-backed Duck and the Stiff-tailed Ducks. Wildfowl, [S. l.], v. 18, p. 98–107, 1967. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155597. Acesso em: 5 apr. 2026.