Regazzoni, Oscar, Yogi Sugito, Agus Suryanto, and adi prawoto. “Solar Energy Efficiency of Cocoa Clones Which Cultivated under Three Species of Shade Trees”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 31, no. 1 (March 31, 2015): 21-29. Accessed September 27, 2022. https://ccrjournal.com/index.php/ccrj/article/view/71.