Pagawak, Davison, Jeffry SJ Lengkong, and Martinus Krowin. “Principal Leadership in Improving Teacher Performance in Junior High Schools”. Abdurrauf Science and Society 1, no. 4 (June 18, 2025): 604–610. Accessed July 23, 2026. https://journal.abdurraufinstitute.org/index.php/asoc/article/view/309.