Mardiana E, Lian B, Mahasir. The Effect Of Teacher Certification And Professionalism On The Performance Of State Vocational School Teachers In Kayu Agung. wib [Internet]. 2024Mar.21 [cited 2026Aug.28];4(1):13-2. Available from: https://www.ejournal.iaitfdumai.ac.id/index.php/wib/article/view/308