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2. Food Composition Data. Production, Management and Use;Greenfield,1992
3. FAO and DHEW, USA. (1968) Food Composition Table for Use in Africa.
4. AOAC (1984) Official Methods of Analysis of the Association Chemists (14th. ed.), Washington, DC
5. Merrill, A.L., and Watt, B.K. (1955) Energy Values of Foods. Basis and Derivation; U.S Dept. Agric., Handbook 74