NIEMAN, D. J.; ISBISTER, R. J. Population Status and Management of Trumpeter Swans in Saskatchewan. Blue Jay, [S. l.], v. 32, n. 2, 1970. DOI: 10.29173/bluejay3943. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3943. Acesso em: 1 may. 2024.