S. N. K. Rubani, Dzulkarnain Hakim Norbashah, Arihasnida Ariffin, Normah Zakaria, and Norhasyimah Hamzah, “Optional and Non-Optional Teacher Competencies from Aspects of Content Knowledge in Vocational College”, RITVET, vol. 1, no. 1, pp. 220–223, Feb. 2021, Accessed: Jul. 03, 2024. [Online]. Available: https://penerbit.uthm.edu.my/periodicals/index.php/ritvet/article/view/276