Maniam, G.P., N. Hindryawati, and M.M. Yusoff. “Rice Husk Silica Supported Oil Palm Fruit Ash As a Catalyst in the Transesterification of Waste Frying Oil”. Journal of Engineering and Technology (JET) 6, no. 1 (June 30, 2015): 1–12. Accessed April 27, 2024. https://jet.utem.edu.my/jet/article/view/180.