Elfina, S. et al. 2023. Transesterification of Palm Oil Catalyzed by CaO/SiO2 Prepared from Limestone and Rice Husk Silica. Journal of Multidisciplinary Applied Natural Science. 4, 1 (Jul. 2023), 49–57. DOI:https://doi.org/10.47352/jmans.2774-3047.185.