Wiryadiputra, Soekadar. 2006. “Effectiveness of Biopesticide Derived FromCassia Spectabilis and Nicotiana Tabacum Leaves Against the Main Insect Pests of Coffee and Its Effect On Other Arthropods”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 22 (1). https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v22i1.27.