1. Niemelä SI (2003) Uncertainty of quantitative determination derived by cultivation of microorganisms. Centre for metrology and accreditation. MIKES Publication J4/2003, Helsinki Finland. ISBN 952-5209-76-8
2. ISO 29201:2012. Water quality—the variability of test results and the uncertainty of measurement of microbiological enumeration methods. International Organization for Standardization, Geneva
3. ISO 5725:1994. Accuracy (trueness and precision) of measurement methods and results. Part 2. International Organization for Standardization, Geneva
4. ISO 5725:1994. Accuracy (trueness and precision) of measurement methods and results. Part 3. International Organization for Standardization, Geneva
5. Tillett H, Lightfoot N (1995) Quality control in environmental microbiology compared with chemistry: What is homogeneous and what is random? Water Sci Technol 31(5):471–477