Hamdan, and Lia Yuliana. “The Influence of Principals’ Managerial Competence, Academic Supervision and Teachers’ Education Level on the Performance of Public Junior High School Teachers in Kuala Kampar Sub-District”. International Journal of Educational Technology Research 3, no. 1 (May 3, 2025): 318–333. Accessed June 14, 2026. https://jurnalinternasional.com/index.php/ijetr/article/view/582.