Hamzah, A., M.S. Solah, and N.F. Paiman. “Motorcycles ‘keep left’ Order: Is It Viable?”. Journal of the Society of Automotive Engineers Malaysia 2, no. 1 (April 28, 2021): 75–79. Accessed January 21, 2025. https://jsaem.my/index.php/journal/article/view/71.