BART, Jonathan; MITCHELL, Carl D; FISHER, Michael N; DUBOVSKY, James A. Detection ratios on winter surveys of Rocky Mountain Trumpeter Swans Cygnus buccinator. Wildfowl, [S. l.], p. 21–28, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/153882. Acesso em: 16 dec. 2025.