O. Trianda, P. Tedja Trisnaning, R. Prastowo, and H. Helmi, “PENENTUAN PERINGKAT BATUBARA BERDASARAKAN ANALISA MASERAL DI DAERAH TANJUNG BELIT, KABUPATEN DHARMASRAYA, PROVINSI SUMATERA BARAT”, Journal Technology of Civil, Electrical, Mechanical, Geology, Mining, and Urban Design, vol. 7, no. 2, pp. 63-70, Nov. 2022.