Ramdhani, D.A., Wega Trisunaryanti and Triyono 2023. Study of green and sustainable heterogeneous catalyst produced from Javanese Moringa oleifera leaf ash for the transesterification of Calophyllum inophyllum seed oil. Communications in Science and Technology. 8, 2 (Dec. 2023), 124-133. DOI:https://doi.org/10.21924/cst.8.2.2023.1202.