OLSEN, Dave; LONG, Bill; MITCHELL, Carl D. Geographic variation in Trumpeter Swan Cygnus buccinator clutch size and egg weights. Wildfowl, [S. l.], v. 65, p. 133–142, 2015. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/153665. Acesso em: 15 apr. 2026.