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Clinical and Laboratory Standards Institute (CLSI). Laboratory Quality Control Based on Risk Management; Approved Guideline. CLSI document EP23-A. CLSI. Wayne, PA: 2011.
Clinical and Laboratory Standards Institute (CLSI). Statistical Quality Control for Quantitative Measurement Procedures: Principles and Definitions; Approved Guideline. 3rd ed. CLSI document C24-A3. CLSI. Wayne, PA: 2006.
Department of Health and Human Services, Centers for Medicare and Medicaid Services. Clinical laboratory improvement amendments of 1988; final rule. Fed Register. 2004(Jan 24):7146 [42CFR493.1256]. Available at: Accessed December 10, 2012.
Westgard JO. Basic QC Practices. 3rd ed. Madison, WI: Westgard QC, Inc: 2010.
Westgard JO, Klee GG. Quality management. In: Burtis CA, Ashwood ER. Bruns DE. Tietz Textbook of Clinical Chemistry and Molecular Diagnostics. 4th ed. St. Louis, MO: Elsevier Saunders: 2006; p. 353 - 407.