Warman, Warman, Soerjo Adi Poernomo, Syafrudin Januar, and Lorensius Amon. 2021. “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 (1):17-24. https://doi.org/10.35877/454RI.eduline581.