Putera, Dwi, Yamin Yamin, and Thoriqi Firdaus. “Reducing Coffee Acidity and Caffeine through the Roasting Method Using Azadirachtaindica Firewood”. Hydrogen: Jurnal Kependidikan Kimia 12, no. 3 (July 5, 2024): 512–525. Accessed September 8, 2026. https://e-journal.undikma.ac.id/index.php/hydrogen/article/view/12140.