BARTONEK, James C; SERIE, Jerome R; CONVERSE, Kathryn A. Mortality in Tundra Swans Cygnus columbianus. Wildfowl, [S. l.], p. 356–358, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154956. Acesso em: 17 dec. 2025.