CLARK, Robert G; BOYD, Hugh; POSTON, Bert. Crop damage, autumn waterfowl populations and cereal grain harvests in the prairie provinces of western Canada. Wildfowl, [S. l.], p. 121–132, 1993. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154681. Acesso em: 17 dec. 2025.