1. Lea, F. M.The Chemistry of Cement and Concrete, 3rd edn, pp. 2, 6, 490. Edward Arnold (Publishers) Ltd, London (1980).
2. Effect of Lime on the Properties of Portland Cement
3. Taylor, H. F. W.The Chemistry of Cement, Vol. 2, 2nd edn, pp. 171 & 191, Academic Press, London (1964).
4. Bogue, R. H.The Chemistry of Portland Cement, 2nd edn, pp. 171 & 174, Reinhold Publishing Corpn, New York (1955).