.Sutarsi, Siswoyo Soekarno, and Sukrisno Widyotomo. “Performance Evaluation of Rotating Cylinder Type Coffee Bean Roaster”. Jurnal Keteknikan Pertanian 24, no. 1 (January 5, 2014). Accessed January 22, 2025. https://journal.ipb.ac.id/index.php/jtep/article/view/7337.