Reta, R., S. Salengke, J. Muhidong, A. Mustafa, S. Syamsia, O. Sumule, and Z. Zaimar. “Fermentation of Arabica Coffee Beans Using Ohmic Heating Technology in Producing Specialty Coffee”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 36, no. 3, Dec. 2020, pp. 226-35, https://ccrjournal.com/index.php/ccrj/article/view/452.