1. ISO/IEC 17025: General requirements for the competence of testing and calibration laboratories, International Organization for Standardization (ISO), Genève, 1999.
2. ISO/IEC Guide 25: General requirements for the competence of calibration and testing laboratories, International Organization for Standardization (ISO), Genève, 1990.
3. G-CSQ-02: Guı́a para los laboratorios que realizan validaciones de métodos de análisis quı́micos, Entidad Nacional de Acreditación (ENAC), 1996.
4. ICH Q2A: Validation of analytical methods: definitions and terminology, International Conference on Harmonization (ICH), 1994.
5. ICH Q2B: Validation of analytical procedures: methodology, International Conference on Harmonization (ICH), 1996.