Kassim, A., K. Ohene-Yankyera, and F. Oduro. “Optimal rice/Colocasia Cropping Systems in the Ashanti, Eastern and Central Regions Within the Semi-Deciduous Forest Zone of Ghana.”. Journal of Science and Technology, Vol. 27, no. 2, Feb. 2016, doi:10.4314/just.v27i2.652.