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Aulianafika Rahmanissa Bedriaty and Cepi Safruddin Abdul Jabar 2025. 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, 1 (Mar. 2025), 41–54. DOI:https://doi.org/10.59890/ijetr.v3i1.397.