1. ICH, Q1B, Stability Testing: Photostability Testing of New Drug Substances and Products http://www.fda.gov/RegulatoryInformation/Guidances/
2. ICH, Q1A (R2), Q1A(R2) Stability Testing of New Drug Substances and Products 2003 http://www.fda.gov/RegulatoryInformation/Guidances/
3. Pharmaceutical photostability: a technical guide and practical interpretation of the ICH Guideline and its application to pharmaceutical stability;Thatcher;Pharm Technol Part II,2001