1. 42 CFR Part 493-Laboratory Requirements. January 10, 2004 edition, pp.967-1087. http://wwwn.cdc.gov/clia/regs/toc.aspx, http://www.access.gpo.gov/nara/ cfr/waisidx_04/42cfr493_04.html
2. Guidance for Industry. 2001. Bioanalytical method validation. U.S. Department of Health and Human Services, Food and Drug Administration, Center for Drug Evaluation and Research (CDER), Center for Veterinary Medicine (CVM), Rockville, MD, May 2001. http://www.fda.gov/cder/guidance/4252fnl.pdf
3. Testing the test
4. The dysfunctional federally mandated proficiency test in cytopathology
5. Sir Francis Galton and Proficiency Testing in Cytopathology