STOFFEL, M. J. First nesting of common ravens in the Saskatoon bird area. Blue Jay, [S. l.], v. 60, n. 4, 2002. DOI: 10.29173/bluejay5552. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/5552. Acesso em: 5 oct. 2022.