BECKLE, P. L. Observations of Longspurs at Bladworth. Blue Jay, [S. l.], v. 16, n. 2, 1958. DOI: 10.29173/bluejay2627. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2627. Acesso em: 6 may. 2024.