Uysal, Sengul, and Yılmaz Sarıer. “Meta-Analysis of School Leadership Effects on Student Achievement in USA and Turkey”. Cypriot Journal of Educational Sciences 13, no. 4 (December 26, 2018): 590–603. Accessed May 19, 2024. https://un-pub.eu/ojs/index.php/cjes/article/view/3539.