KRISTIANSEN, J N; WALSH, A J; FOX, A D; BOYD, H; STROUD, D A. Variation in the belly barrings of the Greenland White-fronted Goose Anser albifrons flavirostris. Wildfowl, [S. l.], p. 21–28, 1999. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154587. Acesso em: 17 dec. 2025.