Hulupi, Retno, Nasrullah ., and Soemartono . “Inheritance of Arabica Coffee Resistance to Radopholus SimilisCobb.”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 23, no. 1 (May 1, 2007). Accessed May 11, 2021. https://www.ccrjournal.com/index.php/ccrj/article/view/53.