Moermond, J. E. and Spindler, M. A. (1997) “Migration route and wintering area of Tundra Swans Cygnus columbianus nesting in the Kobuk-Selawik Lowlands, North-West Alaska”, Wildfowl, pp. 16–25. Available at: https://tidsskrift.dk/Wildfowl/article/view/154103 (Accessed: 13 February 2026).