Susilawati, S. et al. 2020. Synthesis of M-Hexaferrites Material Based on Natural Iron Sand with Metal Co Doping Using the Coprecipitation Method. Jurnal Penelitian Pendidikan IPA. 7, 1 (Nov. 2020), 1–4. DOI:https://doi.org/10.29303/jppipa.v7i1.461.