“Van Hail Levels Included the Content of Math Curriculum of Preparatory School”. ALUSTATH JOURNAL FOR HUMAN AND SOCIAL SCIENCES 222, no. 2 (November 6, 2018): 265–282. Accessed May 4, 2024. https://alustath.uobaghdad.edu.iq/index.php/UJIRCO/article/view/398.