Prastowo, Erwin, and Rina Arimarsetiowati. “Morphological Variations of Robusta Coffee As a Response to Different Altitude in Lampung”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 35, no. 2 (August 31, 2019): 103-118. Accessed September 26, 2022. https://ccrjournal.com/index.php/ccrj/article/view/378.