DOUTHWAITE, R J. Seasonal changes in the food supply, numbers and male plumages of Pigmy Geese on the Thamalakane river in northen Botswana. Wildfowl, [S. l.], p. 94–98, 1980. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154155. Acesso em: 18 dec. 2025.