KREBA, Robert. Townsend’s Solitaire and Black-Headed Grosbeak at Weyburn. Blue Jay, [S. l.], v. 30, n. 1, 1972. DOI: 10.29173/bluejay3684. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3684. Acesso em: 4 apr. 2025.