M.Y. Al-Khafaji, Wasf, Bushra K. Mohammed, and Naktal J.Y. Al-Khalidi. “The Effect of Mastery Learning Strategy on the Development of Academic Achievement for Sixth Primary Class Pupils”. College of Basic Education Research Journal 14, no. 2 (August 1, 2018): 307–330. Accessed October 26, 2025. https://stats.uomosul.edu.iq/index.php/berj/article/view/38835.