Dharmawan, Andi, Firstyoryza Cahyo, and Sukrisno Widyotomo. 2018. “Determining Optimum Point of Robusta Coffee Bean Roasting Process for Taste Consistency”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 34 (1), 59-65. https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v34i1.308.