Jumbadi, Jumbadi. “Non-Metallic Mineral and Rock Mining Policy Within Metallic Mineral Concession Areas: Analysis and Strategic Recommendations”. Jurnal Indonesia Sosial Sains 6, no. 8 (August 12, 2025): 2627–2645. Accessed November 7, 2025. https://jiss.publikasiindonesia.id/index.php/jiss/article/view/1830.