MOERMOND, Jack E; SPINDLER, Michael A. Migration route and wintering area of Tundra Swans Cygnus columbianus nesting in the Kobuk-Selawik Lowlands, North-West Alaska. Wildfowl, [S. l.], p. 16–25, 1997. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154103. Acesso em: 17 dec. 2025.