1. EURACHEM/CITAC Guide CG 4 , Quantifying Uncertainty in Analytical Measurement , ed. S. L. R. Ellison and A. Williams , EURACHEM/CITAC , 3rd edn, 2012
2. Revision of the International System of Units (Background paper)
3. Quantities describing compositions of mixtures
4. Quantities Units and Symbols in Physical Chemistry , ed. I. Mills , et al. , RSC Publishing , Cambridge , 3rd edn, 2007
5. The International System of Units , BIPM , 9th edn, 2019 , https://www.bipm.org/en/publications/si-brochure/