International Union of Pure and Applied Chemistry. Commission on Symbols, Terminology and Units, McGlashan, M. L., & Paul, M. A. (1975). Manual of symbols and terminology for physichochemical quantities and units: Adopted by the IUPAC Council at Cortina d'Ampezzo, Italy, on 7 July, 1969. Butterworths.

International Union of Pure and Applied Chemistry. Commission on Symbols, Terminology and Units, Maxwell Len McGlashan, and M. A. Paul. Manual of Symbols and Terminology for Physichochemical Quantities and Units: Adopted by the IUPAC Council at Cortina D'Ampezzo, Italy, on 7 July, 1969. London: Butterworths, 1975.

International Union of Pure and Applied Chemistry. Commission on Symbols, Terminology and Units, et al. Manual of Symbols and Terminology for Physichochemical Quantities and Units: Adopted by the IUPAC Council at Cortina D'Ampezzo, Italy, on 7 July, 1969. Butterworths, 1975.