santosa, kresna mulya, Hendy Firmanto, and Ilham Mufandi. “The Potential of Coffee and Cocoa Shell Waste As An Energy Source: Analysis of Characteristics of Briquettes From Coffee and Cocoa Shell Waste Through The Carbonization Process”. Agroindustrial Technology Journal 7, no. 3 (May 19, 2024): 88–103. Accessed January 22, 2025. https://ejournal.unida.gontor.ac.id/index.php/atj/article/view/11245.