Siegfried, W R, P A R Hockey, P G Ryan, and A L Bosman. “Sex and Plumage-Type Ratios of the Lesser Magellan Goose in Southern Chile”. Wildfowl (January 1, 1988): 15–21. Accessed December 16, 2025. https://tidsskrift.dk/Wildfowl/article/view/154738.