Soffi, Siti N. Shahshina, and Ahmad M. Sharif. 2014. “Kepimpinan Transformasi Pengarah Kolej Vokasional Dan Efikasi Kendiri Pensyarah Kolej Vokasional: Transformational Leadership of Vocational College Directors and Self-Efficacy of Vocational College Lecturers”. EDUCATUM Journal of Science, Mathematics and Technology 1 (2). https://ojs.upsi.edu.my/index.php/EJSMT/article/view/22.