WORDEN, Jenny; CRANSWICK, Peter A; CROWE, Olivia; MCELWAINE, Graham; REES, Eileen C. Numbers and distribution of Bewick’s Swan Cygnus columbianus bewickii wintering in Britain and Ireland: results of international censuses, January 1995, 2000 and 2005. Wildfowl, [S. l.], p. 3–22, 2013. Disponível em: https://tidsskrift.dk/Wildfowl/article/view/153969. Acesso em: 17 dec. 2025.