1. ISO 3534-1 (1993a), Statistics – vocabulary and symbols, International Organization for Standardization, Geneva.
2. Eurachem/EUROLAB/CITAC/Nordtest/AMC Guide: Measurement uncertainty arising from sampling: a guide to methods and approaches Eurachem , ed. M. H. Ramsey and S. L. R. Ellison , 2007 , p. 40 , ISBN 978 0 948926 26 6, Example A2
3. Uncertainty factor: an alternative way to express measurement uncertainty in chemical measurement
4. Combined uncertainty factor for sampling and analysis