ERSKINE, A. J. The Breeding Bird Survey in Canada. Blue Jay, [S. l.], v. 28, n. 1, 1970. DOI: 10.29173/bluejay3636. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3636. Acesso em: 5 may. 2024.