H. Azman, A., S. S.K. Singh, W. G.W. Aizon, H. Hishamuddin, M. R.M. Yazid, S. Abdullah, A. K. Ariffin, et al. 2018. “The Needs to Establish an Integrated Safety System for Express Bus”. International Journal of Engineering & Technology 7 (4.36): 1537-40. https://doi.org/10.14419/ijet.v7i4.36.29367.