VERMEER, Kees; LEVINGS, Colin D. Populations, biomass and food habits of ducks on the Fraser Delta intertidal area, British Columbia. Wildfowl, [S. l.], p. 12, 1977. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154362. Acesso em: 13 feb. 2026.