Said Ahmad, I. ., S. Abubakar, Farouk Lawan Gambo, and M. S. . Gadanya. “A Rule-Based Expert System for Automobile Fault Diagnosis”. International Journal on Perceptive and Cognitive Computing, vol. 7, no. 1, July 2021, pp. 20-25, https://journals.iium.edu.my/kict/index.php/IJPCC/article/view/204.