Sari PP, Ganefri G, Anwar M. The contribution of principal leadership style, teachers’ professional competence and school climate on the quality of learning outcomes at Vocational High School in Padang. JPTK [Internet]. 2020 Feb. 24 [cited 2025 Oct. 22];3(1):25-9. Available from: http://jptk.ppj.unp.ac.id/index.php/jptk/article/view/36