Spindler, Michael A, and Kent F Hall. “Local Movements and Habitat Use of Tundra or Whistling Swans Cygnus Columbianus in Kobuk-Selawik Lowlands of Northwest Alaska”. Wildfowl (January 1, 1991): 17–32. Accessed February 13, 2026. https://tidsskrift.dk/Wildfowl/article/view/154071.