Douthwaite, R J. “Seasonal Changes in the Food Supply, Numbers and Male Plumages of Pigmy Geese on the Thamalakane River in Northen Botswana”. Wildfowl (January 1, 1980): 94–98. Accessed December 18, 2025. https://tidsskrift.dk/Wildfowl/article/view/154155.