SEYMOUR, Norman R. Interspecific territoriality and competitive interactions between American Black Ducks Anas rubripes and Mallard A. platyrhynchos. Wildfowl, [S. l.], p. 152–155, 1992. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155355. Acesso em: 17 dec. 2025.