Farah, D., Z. A. Zaibunnisa, A.H, and M. Jati. “Optimization of Cocoa Nib Roasting Based on Sensory Properties and Colour Using Response Surface Methodology”. Pelita Perkebunan (a Coffee and Cocoa Research Journal), Vol. 28, no. 1, 1, pp. 45-54, doi:10.22302/iccri.jur.pelitaperkebunan.v28i1.163.