TRIANDA, O.; TEDJA TRISNANING, P.; PRASTOWO, R. .; HELMI, H. PENENTUAN PERINGKAT BATUBARA BERDASARAKAN ANALISA MASERAL DI DAERAH TANJUNG BELIT, KABUPATEN DHARMASRAYA, PROVINSI SUMATERA BARAT. KURVATEK, [S. l.], v. 7, n. 2, p. 63–70, 2022. DOI: 10.33579/krvtk.v7i2.3169. Disponível em: https://journal.itny.ac.id/index.php/krvtk/article/view/3169. Acesso em: 3 apr. 2025.