ROOTH, Jan; EBBINGE, Barwolt; VAN HAPEREN, Anton; LOK, Martin; TIMMERMAN, Arend; PHILIPPONA, Jules; VAN DEN BERGH, Leo. Numbers and distribution of wild geese in the Netherlands, 1974-1979. Wildfowl, [S. l.], p. 146–155, 1981. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154179. Acesso em: 13 feb. 2026.