HRUSKA, A. J. Unusual Black-eyed Susan. Blue Jay, [S. l.], v. 21, n. 1, 1963. DOI: 10.29173/bluejay2778. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2778. Acesso em: 4 may. 2024.