Pujiyanto, P. “Granules Composed of Cocoa Pod Husk Enriched With Minerals and Their Effects on Growth of Coffee and Cocoa Seedlings”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 25, no. 3, Dec. 2009, doi:10.22302/iccri.jur.pelitaperkebunan.v25i3.112.