FRIESEN, Victor C. Hummingbird and Non-Foraging Sapsucker. Blue Jay, [S. l.], v. 45, n. 2, 1987. DOI: 10.29173/bluejay4850. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/4850. Acesso em: 7 may. 2024.