1. Ulm, S. Gurkin. The Effect of Storage Conditions on Selected Quality Attributes of Sweetpotato Flour. Knoxville: Thesis of the University of Tennessee.
2. Roa, J. R. 1995. Taking Root: Proceedings of the Third UPWARD Review and Planning Workshop. UPWARD, Los Banos. 1995, Laguna, Philippines. pp.73
3. Okigbo, B. N. 1989.New Crops for Food and Industry. International Symposium on New Crops for Food and Industry, Southampton 1986Edited by: Wickens, G., Haq, N. and Day, P. 123London: Chapman and Hall.