1. Implementation of revised schedule ‘M’ and SSI;Roy;The Indian Pharmacist,2003
2. Impurities in new drug substances Q3A (R2),2006
3. Good and Gilman's The Pharmaceutical Basics of Therapeutics;Hardman,1999
4. Identification and Determination of Impurities in Drugs;Gorog,2000
5. Impurities Evaluation of Pharmaceuticals;Ahuja,1998