Ginting, Erika Sari, and Retno Widodo Dwi Pramono. “Improving Mineral Mining License System in North Sumatera Indonesia”. Cakrawala 14, no. 1 (June 3, 2020): 51–65. Accessed June 15, 2026. https://cakrawalajournal.org/index.php/cakrawala/article/view/321.