Setyawan, Bayu, Taryono ., and Suyadi Mitrowihardjo. 2016. “Determination of Selection Index of Cocoa (Theobroma Cacao L.) Yield Traits Using Regression Methods”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 32 (2), 101-8. https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v32i2.229.