Prawoto, A., N. Qomariyah, S. Rahayu, and B. Kusmanadhi. “(Agronomical and Anatomical Study of Resulted Early Cocoa (Theobroma Cacao L.) Grafting”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 21, no. 1, May 2005, doi:10.22302/iccri.jur.pelitaperkebunan.v21i1.123.