HENSON, Paul; COOPER, James A. Division of labour in breeding Trumpeter Swans Cygnus buccinator. Wildfowl, [S. l.], v. 43, p. 40–48, 1992. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/155366. Acesso em: 15 apr. 2026.