Rahardjo, P., and F. Sophia Hartatri. “Use of Acrylic Acid Sodium Acrylate Polymer to Maintain Cocoa Seed Viability”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 26, no. 2, Aug. 2010, doi:10.22302/iccri.jur.pelitaperkebunan.v26i2.127.