ROY, J. F. Annual May Bird Count, Saskatoon. Blue Jay, [S. l.], v. 25, n. 3, 1967. DOI: 10.29173/bluejay3361. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3361. Acesso em: 5 may. 2024.