Erry Prasmatiwi, Fembriarti, Irham Irham, Any Suryantini, and Jamhari Jamhari. “Sustainability Analysis of Coffee Farming in Protected Forestof West Lampung Based on Enviromental Economic Value”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 26, no. 1 (May 1, 2010). Accessed September 28, 2022. https://ccrjournal.com/index.php/ccrj/article/view/117.