HOUSTON, Mary. Thirtieth Annual Saskatchewan Christmas Bird Count, 1971. Blue Jay, [S. l.], v. 30, n. 1, 1972. DOI: 10.29173/bluejay3677. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3677. Acesso em: 16 apr. 2025.