Mohd Khathri, A., M. R. Salleh, and R. Mamat. “Combustion Characteristics of Direct Injection (DI) Diesel Engine Fueled With 2-Butyl Alcohol/ Diesel Blends at Different Speed”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 3, no. Special Issue, July 2018, pp. 1-11, https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/372.