Pakhshan Hawez Hasan, Hussen Saadi Ibrahim, 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. QZJ [انترنت]. 30 سبتمبر، 2021 [وثق 19 مايو، 2024];6(3):372-409. موجود في: https://journal.lfu.edu.krd/ojs/index.php/qzj/article/view/696