SHADICK, S. Possible Great Black-Backed Gull in Saskatchewan. Blue Jay, [S. l.], v. 41, n. 4, 1983. DOI: 10.29173/bluejay4370. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/4370. Acesso em: 28 apr. 2025.