Managerial Leadership of the Principal in Improving Teacher Quality: A Multi-Case Study at State Senior High School 1 Ambalawi and Darul Husna Senior High School Ambalawi, Bima Regency. JISIP [Internet]. 2026 Jan. 7 [cited 2026 Jun. 21];10(1):549-56. Available from: https://ejournal.mandalanursa.org/index.php/JISIP/article/view/10124