SASKATCHEWAN NATURAL HISTORY SOCIETY. Plant Notes: Long-Headed Cone-Flower. Blue Jay, [S. l.], v. 18, n. 4, 1960. DOI: 10.29173/bluejay2192. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/2192. Acesso em: 23 mar. 2025.