Purbasari, Diana, Rosihan Pebrianto, and Edwin Harsiga. “POTENSI LOGAM TANAH JARANG DI DALAM ABU BATUBARA”. MINERAL 8, no. 2 (December 8, 2023): 1-7. Accessed May 9, 2024. https://journal.ubb.ac.id/mineral/article/view/4364.