1. Skoog D A, West D M, Holler FJ: Introduction of analytical chemistry. Sounder college of publishing, Harcourt Brace college publishers. (1994), PP 1-5.
2. Sharma B K, Instrumental method of chemical analysis Meerut. (1999), PP 175-203.
3. Breaux J and Jones K: Understanding and implementing efficient analytical method development and validation. Journal of Pharmaceutical Technology (2003), 5, PP 110-114.
4. Willard, H. y. Merritt L.L, Dean J.A and Settle F.A “Instrumental methods of analysis” 7th edition CBS Publisher and Distributors, New Delhi, (1991), PP 436-439.
5. Meyer V.R. Practical High-Performance Liquid Chromatography, 4th Ed. England, John Wiley and Sons Ltd, (2004), PP 7-8.