Trianda, Obrin, Paramitha Tedja Trisnaning, Rizqi Prastowo, and Hurien Helmi. “PENENTUAN PERINGKAT BATUBARA BERDASARAKAN ANALISA MASERAL DI DAERAH TANJUNG BELIT, KABUPATEN DHARMASRAYA, PROVINSI SUMATERA BARAT”. KURVATEK 7, no. 2 (November 17, 2022): 63–70. Accessed April 3, 2025. https://journal.itny.ac.id/index.php/krvtk/article/view/3169.