“Analisa XRD Terhadap Perubahan Struktur Dan Kristalinitas Karbonisasi Batubara Sawahlunto – Sijunjung Sumatera Barat: XRD Analysis of Changes in the Structure and Crystallinity of Sawahlunto - Sijunjung West Sumatra Coal Carbonization”. Talenta Conference Series: Science and Technology (ST) 2, no. 1 (January 30, 2019): 88–91. Accessed May 1, 2026. https://talentaconfseries.usu.ac.id/index.php/st/article/view/321.