Salleh, Mohd Rosdi, et al. “Experimental Investigation the RON 95 and RON 97 on the Performance and Emissions”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 3, no. Special Issue, July 2018, pp. 22-33, https://app.mypolycc.edu.my/journal/PMJET/article/view/375.