Rahmad, Basuki. “Pembentukan Silicified Wood (Silicified Coal) Di Lapisan Batubara Seam-1 Dan Dampak Operasional Penambangan, Daerah Muara Wahau, Kab. Kutai Timur, Kalimantan Timur”. ReTII (November 9, 2021): 535 - 543. Accessed November 25, 2024. //journal.itny.ac.id/index.php/ReTII/article/view/2737.