HOUSTON, Mary. Twenty-Eighth Annual Saskatchewan Christmas Bird Count, 1969. Blue Jay, [S. l.], v. 28, n. 1, 1970. DOI: 10.29173/bluejay3635. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3635. Acesso em: 16 apr. 2025.