Salimon, Jumat, and Ainaatul Asmaa’ Ishak. “Optimization Process for Esterification of Rubber Seed Oil (RSO) With Trimethylolpropane (TMP)”. Journal of Science and Technology 4, no. 1 (1). Accessed May 25, 2020. https://publisher.uthm.edu.my/ojs/index.php/JST/article/view/470.