Abdullah, Mohd Fahmy, Lai Wei Sieng, Noorasiah Sulaiman, and Mohd Hilmi Izwan Abd Rahim. 2020. “Measuring Inefficiency in The Rubber Manufacturing Industry”. International Journal of Economics, Management and Accounting 28 (1):79-96. https://journals.iium.edu.my/enmjournal/index.php/enmj/article/view/726.