Winarsih, Sri. “Preliminary Research of the Effect of Shading and Pruning on Cocoa Production”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 6, no. 2 (August 31, 1990): 47-51. Accessed September 26, 2022. https://ccrjournal.com/index.php/ccrj/article/view/367.