O. Boonseng, V. Santisopasri, A. Soommart, and D. Paetayakratok, “Effect of Planting Seasons, Varieties and Harvesting Times on Biochemical Properties of Cassava (Manihot esculenta Crantz) Roots”, Agr. Nat. Resour., vol. 33, no. 4, pp. 497–506, Dec. 1999.