“PERBANDINGAN NILAI KALORI BATUBARA ANTARA HASIL BLENDING DAN HASIL ANALISA REGRESI LINIER”. PROCEEDINGS OF NATIONAL COLLOQUIUM RESEARCH AND COMMUNITY SERVICE 1 (September 28, 2018). Accessed August 3, 2026. https://www.journal.ubb.ac.id/index.php/snppm/article/view/543.