WRIGHT, R M; PHILLIPS, V E. Reducing the breeding success of Canada and Greylag Geese, Branta canadensis and Anser anser, on gravel pits. Wildfowl, [S. l.], p. 42–44, 1991. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154081. Acesso em: 17 dec. 2025.