HOUSTON, C. Stuart; HOUSTON, Mary I. Audubon Christmas Bird Counts: Saskatchewan Tops in High Individual Numbers. Blue Jay, [S. l.], v. 47, n. 1, 1989. DOI: 10.29173/bluejay4963. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/4963. Acesso em: 25 apr. 2024.