Zulkifli, Siti Liyana Amalina, Siti Sarah Omar, Zailin Zainal Ariffin, Normahaza Mahadi, and Azizul Yadi Yaakop. 2021. “A Review of Leadership Approaches in the Industrial Revolution of 4.0 Era”. Online Journal for TVET Practitioners 6 (2):21-27. https://publisher.uthm.edu.my/ojs/index.php/oj-tp/article/view/8648.