1. ISO/IEC 17025 (2017) General requirements for the competence of testing and calibration laboratories. International Organization for Standardization/International Electrotechnical Committee, Geneva
2. ISO 15189 (2012) Medical laboratories—requirements for quality and competence. International Organization for Standardization, Geneva
3. ISO 17034 (2016) General requirements for the competence of reference material producers. International Organization for Standardization, Geneva
4. ISO/IEC 17043 (2010) Conformity assessment—General requirements for proficiency testing. International Organization for Standardization/International Electrotechnical Committee, Geneva
5. www.ilac.org