كاملأ.م.د. جنان. “Reality of Management Performance in Accordance With the Halinger Standard and Its Relation to Performance Excellence at High School Principals”. ALUSTATH JOURNAL FOR HUMAN AND SOCIAL SCIENCES 1, no. 7 (November 17, 2019): 39-74. Accessed November 29, 2019. http://alustath.uobaghdad.edu.iq/index.php/UJIRCO/article/view/952.