Pakhshan Hawez Hasan, Hussen Saadi Ibrahim, and Serwan Arab Sadiq. “The Effect of the Differentiated Instruction Strategy on Developing : Students’ Cognitive Achievement of the Twelfth Literary Grade in Geography and Retaining It”. QALAAI ZANIST JOURNAL 6, no. 3 (September 30, 2021): 372–409. Accessed July 22, 2024. https://journal.lfu.edu.krd/ojs/index.php/qzj/article/view/696.