ROY, J. F. Annual May Day Bird Count, Saskatoon. Blue Jay, [S. l.], v. 26, n. 3, 1968. DOI: 10.29173/bluejay3397. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3397. Acesso em: 22 jul. 2024.