Lai, J. Y., L. H. Ngu, and F. Twaiq. “Influence of Ethanol Concentration and Template Ion Exchange Agent on Template Recycling in Mobil Crystalline Material 41 (MCM-41) Synthesis”. ASEAN Journal of Chemical Engineering, Vol. 19, no. 2, Dec. 2019, pp. 130-46, https://jurnal.ugm.ac.id/v3/AJChE/article/view/9089.