Setiawan, Adi, Juwaini, Ahmad Nayan, Fauzan, and Faisal. 2018. “Mechanical and Physical Properties of Bio-Briquette Produced from Gayo Arabica Coffee-Skin”. Proceedings of International Conference on Multidisciplinary Engineering (ICOMDEN) 1 (December):00013. https://proceedings.unimal.ac.id/icomden/article/view/1021.