1. 1. W.G. Cutler, and E. Kissa (1987 ) Detergency-Theory and Technology , p.46 . Marcel Dekker, Inc., New York.
2. 2. E.R. Trotman (1984 ) Dyeing and Chemical Technology of Textile Fibres , p.132 . Charles Griffin and Company Limited, High Wycombe.
3. 3. B.M. Milwidsky, and D.M. Gabriel (1982 ) Detergent Analysis , p.172 . John Wiley and Sons, New York.
4. 4. E.R. Trotman , op. cit., p.135 .
5. 5. D. Price (1952 ) Detergents-What they are and what they do , p.39 . Chemical Publishing Co., New York.