LAHRMAN, F. W. A Second Pair of Trumpeter Swans Nesting in Saskatchewan. Blue Jay, [S. l.], v. 19, n. 1, 1961. DOI: 10.29173/bluejay2396. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2396. Acesso em: 6 dec. 2022.