1. International Standards Organisation, ISO 17025:2005 — General Requirements for the Competence of Testing and Calibration Laboratories, ISO, Geneva, 2005.
2. International Standards Organisation, ISO 9001:2000 Quality Management Systems — Requirements, ISO, Geneva, 2000.
3. International Standards Organisation, ISO Guide 34, General Requirements for the Competence of Reference Material Providers, ISO, Geneva, 2000.
4. International Standards Organisation, ISO Guide 43, Proficiency Testing by Interlaboratory Comparisons — Part 1: Development and Operation of Proficiency Testing Schemes, ISO, Geneva, 1997.
5. UKAS Website: http://www.ukas.com