NERO, R. W. A Record of Flight Altitude of Whistling Swans. Blue Jay, [S. l.], v. 18, n. 4, 1960. DOI: 10.29173/bluejay2184. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2184. Acesso em: 17 may. 2024.