Moermond, Jack E, and Michael A Spindler. “Migration Route and Wintering Area of Tundra Swans Cygnus Columbianus Nesting in the Kobuk-Selawik Lowlands, North-West Alaska”. Wildfowl (January 1, 1997): 16–25. Accessed December 17, 2025. https://tidsskrift.dk/Wildfowl/article/view/154103.