' Davidson, S., Passmore, R., Brock, J.F. and Truswell, A.S. (1979). Human Nutrition and Dietetics7th edit. Churchill Living-stone.
2.
Paul. A.A. and Southgate, D.A.T. (1978). The Composition of Foods4th edit. HMSO.
3.
Platt. B.S. (1975). Tables of Representative Values of Foods Commonly Used in Tropical Countries, Medical Research Council Special Rep No 302. HMSO.
4.
Passmore, R. , Nichol, B.M., Rao, M.N., Beaton. G.H. and De Maeyer . E.M. (1974). Handbook on Human Nutritional Requirements. FAO Nutritional Studies No 28, Rome: FAO.
5.
Department Of Health And Social Security (1979): Recommended Daily Amounts of Food Energy and Nutrients for Groups of People in the United Kingdom. Report on Health and Social Subjects No 15. HMSO.
6.
Prasad. A.S. (1976). Trace Elements in Human Health and Disease, Vol I, Zinc and Copper. Edit. A. S. Prasad. Academic Press.
7.
Goodhart, R.S. and Shils, M.E. (1973). Modern Nutrition in Health and Disease5th edit. Lea and Febiger, p.59.