Ariyanti, Widya, Any Suryantini, and Jamhari Jamhari. “Is It More Profitable to Sell Ground Coffee?”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 35, no. 1 (April 30, 2019): 59-69. Accessed May 18, 2022. https://ccrjournal.com/index.php/ccrj/article/view/351.