1. Hahn, S.K., Yams: Dioscorea spp. (Dioscoreaceae). In: J. Smartt and N.W. Simmonds (Eds), Evolution of crop plants, Longman Scientific and technical, UK. (1995), pp.112-120.
2. Udensi E.A., Oselebe H.O., and Iweala O. O, Pakistan Journal of Nutrition, 7(2): 324-344. (2008).
3. Jill E. Wilson and Linda S. Hamilton, Agro-Facts, Crops, IRETA Publication 1/88 (1988).
4. Sharifah "Colloquium on Research Program for Discorea Hispida (Ubi gadung), (2011) 16 February 2011, Kuala Terengganu, Malaysia.
5. Megh Raj Bhandari and Jun Kawabata, Plant Foods for Human Nutrition 60: 129-135 (2005).