SHEA, Ruth; LOCKMAN, Dave C; MITCHELL, Carl D. Trumpeter Swan Cygnus buccinator range expansion programs in the northern Rocky Mountains, USA. Wildfowl, [S. l.], p. 348–351, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/154950. Acesso em: 16 dec. 2025.