REES, Eileen C. et al. International census and population trends for Bewick’s Swans Cygnus columbianus bewickii wintering from the East Mediterranean to Central Asia. Wildfowl, [S. l.], p. 179–201, 2024. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/156361. Acesso em: 16 dec. 2025.