Wiryadiputra, Soekadar. 2007. “Establishment of Black Ant (Dolichoderus thoracicus)on Cocoa Plantation and Its Effects on Helopeltisspp. Infestation”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 23 (1). https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v23i1.50.