YOUSEFI, Z.; NEGARESH, K.; KAYA, Y. A taxonomic study on Psephellus sect. Amblyopogon (Asteraceae, Cardueae—Centaureinae). Phytotaxa, Auckland, New Zealand, v. 494, n. 3, p. 273–288, 2021. DOI: 10.11646/phytotaxa.494.3.3. Disponível em: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.494.3.3. Acesso em: 6 dec. 2025.