BART, Jonathan; LIMPERT, Roland; EARNST, Susan; SLADEN, William; HINES, James; ROTHE, Thomas. Demography of Eastern Population Tundra Swans Cygnus columbianus. Wildfowl, [S. l.], p. 178–184, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154990. Acesso em: 17 dec. 2025.