M. Basir. S. Hasibuan, Syawal Gultom, and Wildansyah Lubis, “EFFECTIVENESS OF PRINCIPAL COMPETENCY MANAGEMENT MODEL BASED ON LESSON STUDY IN IMPROVING THE QUALITY OF ACADEMIC SUPERVISION AND LEARNING IN STATE HIGH SCHOOLS”, MORFAI, vol. 5, no. 5, pp. 2594–2601, Jul. 2025.