MUBARAK Z. MANAGERIAL COMPETENCIES OF PRINCIPALS AND THE INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ISO 9001:2000 IN IMPROVING THE TEACHER WORK DISCIPLINE. JKP UHAMKA [Internet]. 2019 Dec. 5 [cited 2024 Dec. 31];2(2):287-30. Available from: https://journal.uhamka.ac.id/index.php/jkp/article/view/4867