Zbar, Khaled Taha. “The Effect of Strategy (PQ4R) on Acquiring Islamic Concepts and Improving Investigation Skills Among Intermediate Stage Students in Iraq”. Journal of Tikrit University for Humanities 26, no. 11 (December 8, 2019): 511–534. Accessed September 10, 2026. https://jtuh.org/index.php/jtuh/article/view/908.