حسينأ.م.د. هدى. “The Effectiveness of Using Learning Centers Strategy Upon Conceptual Comprehension and Retention in History Subject for the Fifth Class Preporatory Students”. ALUSTATH JOURNAL FOR HUMAN AND SOCIAL SCIENCES 1, no. 7 (November 17, 2019): 103-128. Accessed November 29, 2019. http://alustath.uobaghdad.edu.iq/index.php/UJIRCO/article/view/959.