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2. 2. Northern Ireland Dairy Council, Belfast (1987 )Calcium.
3. 3. K. Mayes (1987 ) Brittle Bones and the Calcium Crisis , pp.33 . Thorson Publishing Group, Wellingborough.
4. 4. M. Warrsink (1976 ) Nutrition and Ageing , pp.138 . John Wiley & Sons, Canada.
5. 5. J. Buttriss (1986 )Calcium, Nutrition and Food Science, No. 100, May/June 1986, 5-8.