1. R. Kellner, J.M. Mermet, M. Otto, M. Valcárcel, H.M. Widmer, “Analytical Chemistry”, 2nd Edition, Chapter 1, Wiley–VCH, Heidelberg, Germany, 2004.
2. “Principles of Analytical Chemistry. A textbook”;Valcárcel,2000
3. Required and delivered analytical information: the need for consistency
4. Analytical chemistry at the interface between metrology and problem solving
5. International Organization for Standardization (ISO), ISO 17025:2005, General Requirements for the Competence of Testing and Calibration Laboratories, ISO, Geneva, Switzerland, 2005.