Santoso, A., Sumari, S., Asrori, M., & Ni’mah, I. (2024). Concentration Effect of MgO/K2O Catalyst on Transesterification of Castor Seed (Ricinus communis) Oil. Stannum : Jurnal Sains Dan Terapan Kimia, 6(2), 96-103. https://doi.org/10.33019/jstk.v6i2.4692