Mohamed, Zulkifley, Ramli Ibrahim, and Saberi Othman. 2019. “Model Pengeluaran Optimum Cassava (Manihot Esculenta Crantz) Melalui Fungsi Pengeluaran Cobb Douglas Dalam Penghasilan Bioetanol: The Optimal Production Model of Cassava (Manihot Esculenta Crantz) through a Cobb Douglas Production Function in the Production of Bioethanol”. Journal of Science and Mathematics Letters 3 (1):24-31. https://ejournal.upsi.edu.my/index.php/JSML/article/view/355.