Kose, Y. B., A. Altintas, O. Tugay, T. Uysal, B. Demirci, K. Ertugrul, and K. H. C. Baser. “COMPOSITION OF THE ESSENTIAL OIL OF TWO ENDEMIC CENTAUREA SPECIES FROM TURKEY”. African Journal of Traditional, Complementary and Alternative Medicines, vol. 6, May 2009, p. 369, https://journals.athmsi.org/index.php/ajtcam/article/view/734.