The Effectiveness of the Implementation of Collaborative-Based Academic Supervision by School Principals to Improve the Professionalism of Senior High School Teachers in Sleman Regency. PE [Internet]. 2026 Jan. 31 [cited 2026 Mar. 27];1(2):65-72. Available from: https://www.publications.corejurnal.com/index.php/pendidikan/article/view/79