Regazzoni, Oscar, Yogi Sugito, Agus Suryanto, and Adi Prawoto. “Physiological Character of Cocoa Clones That Cultivated under Three Species of Shade Trees”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 30, no. 3 (February 26, 2015): 198-207. Accessed September 27, 2022. https://ccrjournal.com/index.php/ccrj/article/view/65.