Aulianafika Rahmanissa Bedriaty, and Cepi Safruddin Abdul Jabar. “The Influence of Principals’ Instructional Leadership, Work Discipline, and Self-Concept on Vocational High Schools Teachers’ Professional Competence”. International Journal of Educational Technology Research 3, no. 1 (March 15, 2025): 41–54. Accessed April 29, 2026. http://jurnalinternasional.com/index.php/ijetr/article/view/397.