FAJARWATI, Delia Aurora; 						LEPONG, Piter; 						WAHIDAH, Wahidah.
 Analisis Proksimat dan Ultimat Terhadap Total Sulfur dan Nilai Kalori pada Batubara  (PT Geoservices Samarinda).
<strong>GEOSAINS KUTAI BASIN</strong>, [S.l.], v. 6, n. 2, p. 126-136, aug. 2023.
ISSN 2615-5176.
Available at: &lt;<a href="https://jurnal.fmipa.unmul.ac.id/index.php/geofis/article/view/1145" target="_new">https://jurnal.fmipa.unmul.ac.id/index.php/geofis/article/view/1145</a>&gt;. Date accessed: 03 july 2024.
doi: <a href="https://doi.org/10.30872/geofisunmul.v6i2.1145">https://doi.org/10.30872/geofisunmul.v6i2.1145</a>.