1. Asia Pacific Laboratory Accreditation Cooperation (http://www.aplac.org).
2. The International Laboratory Accreditation Cooperation (http://www.ilac.org).
3. International Standards Organization, ISO/IEC 17025, Gerneral requirements for the competence of testing and calibration laboratories, ISO, Geneva, Switzerland, 2005.
4. D. Patton, 11 November 2006 (http://www.ap-foodtechnology.com/Processing/Sudan-Red-found-in-new-regions-of-China).
5. Wikipedia, Malachite green (http://en.wikipedia.org/wiki/Malachite_green).