CONANT, Bruce; HODGES, John I; KING, James G. Continuity and advancement of Trumpeter Swan Cygnus buccinator and Tundra Swan C. columbianus population monitoring in Alaska. Wildfowl, [S. l.], p. 125–136, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154993. Acesso em: 17 dec. 2025.