Erwiyono, R., Sucahyo, A., ., S. and Winarso, S. (2006) “Effectiveness of Foliar Application of Potassium on Flowering and Fruiting of Cocoa”, Pelita Perkebunan (a Coffee and Cocoa Research Journal), 22(1). doi: 10.22302/iccri.jur.pelitaperkebunan.v22i1.26.