“The Influence of Principal Academic Supervision and Work Motivation on State High School Teacher Performance in Toba Regency”. JUPE : Jurnal Pendidikan Mandala 9, no. 2 (June 26, 2024): 565–584. Accessed June 23, 2026. https://ejournal.mandalanursa.org/index.php/JUPE/article/view/7101.