Fathira, Riri Lidya, Irfan Satria Permana, and Randy M. Oswara. “Analisis Kelayakan Investasi Pada Pertambangan Batubara PT. XYZ Kecamatan XYZ Kabupaten Indragiri Hilir Provinsi Riau”. Innovative: Journal Of Social Science Research 4, no. 4 (July 22, 2024): 3569–3580. Accessed May 3, 2026. https://j-innovative.org/index.php/Innovative/article/view/13497.