Asna, A., K. Presannakumari, J. Minimol, and S. Krishnan. “Variability Analysis in Bean Characters of Selected Accessions of Cocoa (Theobroma Cacao L.)”. Journal of Plantation Crops, vol. 42, no. 2, Apr. 2014, pp. 246-51, https://updatepublishing.com/journal/index.php/JPC/article/view/5609.