1. F. M. Garfield, E. Klesta, and J. Hirsch. Quality assurance principles for analytical laboratories, Third Edition. AOAC International: Gaithersburg, MD. 2000
2. ISO/IEC 17025:2005 General requirements for the competence of testing and calibration laboratories. Available in the U.S. from the American National Standards Institute (ANSI) web store
http://webstore.ansi.org/