Harianto, Mashudi, and Isa Anshori. “ The Principal’s Strategy in Improving the Quality of Teacher Competence at Senior High School”. Academia Open 60 (June 30, 2022): 10.21070/acopen.6.2022.2287. Accessed April 23, 2024. https://acopen.umsida.ac.id/index.php/acopen/article/view/2287.