1. CEN/CENELEC, EN 45001: General Criteria for the Operation of Testing Laboratories, Brussels, 1989.
2. ISO/IEC, ISO/IEC Guide 25: General Requirements for the Competence of Testing and Calibration Laboratories, Geneva, 1985.
3. ISO/IEC, ISO/IEC Guide 2: Standardisation and Related Activities – General Vocabulary, Geneva, 1996.
4. ISO/IEC, ISO/IEC Guide 60: ISO/IEC Code of Good Practice for Conformity Assessment, Geneva, 1994.
5. ISO/CASCO