“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” (2019) Talenta Conference Series: Science and Technology (ST), 2(1), pp. 88–91. doi:10.32734/st.v2i1.321.