Indriawati, A., H. Aldila, and V. Fabiani. “Synthesis of Rare Earth Metal Oxides Based on Monasite Sand With PH Variations”. Stannum : Jurnal Sains Dan Terapan Kimia, Vol. 2, no. 2, Oct. 2020, pp. 36-39, doi:10.33019/jstk.v2i2.1953.