Warman, Warman, Soerjo Adi Poernomo, Syafrudin Januar, and Lorensius Amon. “Leadership Style and Principal Supervision in Improving Teacher Performance at State High Schools in Kutai Kartanegara Regency, East Kalimantan Province, Indonesia”. EduLine: Journal of Education and Learning Innovation 2, no. 1 (October 30, 2021): 17–24. Accessed April 24, 2026. https://qemsjournal.org/index.php/eduline/article/view/581.