Santy, Lauti Dwita, and Hermes Panggabean. “The Potential of Ketungau and Silat Shales in Ketungau and Melawi Basins, West Kalimantan: For Oil Shale and Shale Gas Exploration”. Indonesian Journal on Geoscience 8, no. 1 (March 28, 2013): 39–53. Accessed February 6, 2025. https://ijog.geologi.esdm.go.id/index.php/IJOG/article/view/154.