“ Pengaruh Kadar Air Terhadap Proses Pencairan Dan Produk Minyak Batubara”. Journal of Chemical Process Engineering 2, no. 1 (May 31, 2017): 9–15. Accessed August 26, 2025. https://jurnal.fti.umi.ac.id/index.php/JCPE/article/view/864.