Pancaningtyas, S. (2015). The effect of 2,4 dichlorophenoxyacetic acid on in vitro callogenesis of cocoa (Theobroma cacao L.). Pelita Perkebunan (a Coffee and Cocoa Research Journal), 31(2), 90-98. https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v31i2.67