Setiawan, A. . “MINERALS AND COAL RESERVES POTENTIAL IN INDONESIA AND THE WORLD: POTENSI CADANGAN MINERAL DAN BATUBARA DI INDONESIA DAN DUNIA”. INTAN Jurnal Penelitian Tambang, vol. 1, no. 1, Feb. 2022, pp. 20-31, doi:10.56139/intan.v1i1.7.