1. A. Cross-Smiecinski, L.D. Stetzenbach, Quality Planning for the Life Science Researcher, CRC Press, Boca Raton, FL, 1994.
2. Quality Assurance of the Analytic Process: Pre- and Postanalytic Variation
3. Analytical quality assurance. A review
4. Revisions of the Laboratory Regulations for the Medicare, Medicaid, and Clinical Laboratory Improvement Act of 1967: Final Rule with Comment Period, USA Federal Register, March 14, 55 (1990) 9538.
5. International Organization for Standardization, General Requirements for the Competence of Calibration and Testing Laboratories, ISO Guide 25, 3rd ed., Geneva, 1990.