Widyotomo, Sukrisno, H. Ahmad, S.T. Soekarno, and Sri Mulato. “Performance of a Horizontal Triple Cylinder Type Pulping Machine”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 27, no. 1 (May 1, 2011). Accessed July 9, 2020. https://ccrjournal.com/index.php/ccrj/article/view/144.