Pakhshan Hawez Hasan, Hussen Saadi Ibrahim, & Serwan Arab Sadiq. (2021). 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(3), 372–409. https://doi.org/10.25212/lfu.qzj.6.3.12