Bakir Mohammed, Z., and زهراء. “Comparative Anatomical Study of Leaves Epidermis for Centaurea Benedicta L. And Carduus Pycnocephalus L. (Asteraceae) in Tikrit City/ Iraq”. Rafidain Journal of Science, vol. 32, no. 4, June 2025, pp. 1-7, doi:10.33899/rjs.2023.181271.