MASHAN DHAIFALLAH ALSHAMMARI. "A proposed concept for developing professional development programs for principals of public education schools in Hail region according to national guidelines and international standards for professional development". المجلة التربوية لکلية التربية بسوهاج, 124, 124, 2024, 231-280. doi: 10.21608/edusohag.2024.295295.1493