H. Azman, A., S. S.K. Singh, W. G.W. Aizon, H. Hishamuddin, M. R.M. Yazid, S. Abdullah, A. K. Ariffin, et al. “The Needs to Establish an Integrated Safety System for Express Bus”. International Journal of Engineering & Technology 7, no. 4.36 (December 9, 2018): 1537–1540. Accessed May 2, 2024. https://www.sciencepubco.com/index.php/ijet/article/view/29367.