Shahab, Aliyah, and Sulton Amna. “EFFICIENCY ANALYSIS OF FIRE TUBE BOILER TYPE AT REFINERY UTILITY UNIT CENTER FOR OIL AND GAS HUMAN RESOURCES DEVELOPME”. Jurnal Cakrawala Ilmiah 2, no. 7 (March 31, 2023): 3109–3118. Accessed July 5, 2025. https://mail.bajangjournal.com/index.php/JCI/article/view/5401.