CALLAGHAN, D A; WORTH, N; HUGHES, B; BROUWER, K. European census of captive North American Ruddy Ducks Oxyura j. jamaicensis. Wildfowl, [S. l.], p. 188–193, 1997. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154112. Acesso em: 17 dec. 2025.