1. N. Garcia-Jacas, T. Uysal, K. Romashchenko, et al. "Annals of Botany." 98, "Centaurea revisited: a molecular survey of the Jacea group." 741 (2006)
2. K. Negaresh and M. R. Rahiminejad "Phytotaxa." 363, "A revision of Centaurea sect. Cynaroides (Asteraceae, Cardueae-Centaureinae)." 1 (2018)
3. A. Adwan, A. Al-Mashhadani, R. Abas, "EurAsian Journal of BioSciences." 14, "Taxonomical features of achene of some species of Centaurea L. (Asteraceae) in Middle and North Iraq." 5109 (2020)
4. S. Aslan, M. Vural, B. Şahin, et al. "Biyolojik Çeşitlilik ve Koruma." 3, "Presence of Centaurea regia Boiss. subsp. regia Subgen. Cynaroides Boiss. ex Walp. Dostál, Compositae in." 185 (2010)
5. S. Ayaz, M. Ahmad, M. Zafar, et al. "Microscopy Research and Technique." 83, "Taxonomic significance of cypsela morphology in tribe Cichoreae (Asteraceae) using light microscopy and scanning electron microscopy." 239 (2020)