1. Guidance for Industry, Q3A Impurities in New Drug Substance;US Food and Drug Administration,2003
2. Guidance for Industry, Q3B Impurities in New Drug Products;US Food and Drug Administration,2006
3. Guidance for Industry, Q3C Impurities: Residual Solvents;US Food and Drug Administration,1997
4. Draft Guidance for Industry, AND As: Impurities in Drug Substances;US Food and Drug Administration,2005
5. Draft Guidance for Industry, ANDAs: Impurities in Drug Products;US Food and Drug Administration,2005