1ISO/IEC 17043:2010, Proficiency testing by inter- laboratory comparisons, International Organization for Standardization.
2ISO 9000:2000, Quality management systems - Fundamentals and vocabulary, International Organization for Standardization, Gend've 1997.
3ISO 17025:1999, General Requirements for the Competence of Testing and Calibration Laboratories, International Organization for Standardization, GenSve 1999.
4APLAC-T030, Food microbiological proficiency testing program- Final report, Food Laboratory of Liaoning Entry- Exit Inspection and Quarantine Bureau, P. R. China.
5Michael Thompson, Roger Wood, International Hormonized Protocol for Proficiency Testing of (Chemical) Analytical Laboratories, J. AOAC International,1993,76(4).
