1. Armstrong Lowe, D. A Guide to International Recommendations on Names and Symbols for Quantities and on Units of Measurement. Geneva: World Health Organization, 1975. Series: Progress in standardization; 2. Bulletin of the World Health Organization. Vol. 52.
2. Bigourdan, Guillaume. Le système métrique des poids et mesures. Son établissement et sa propagation graduelle, avec l’histoire des opérations qui ont servi à déterminer le mètre et le kilogramme. Paris: Gauthier-Villars, 1901.
3. Carnegie, Andrew. James Watt. Edinburgh: Anderson & Ferrier, 1900.
4. Clark, Josiah Latimer. A dictionary of metric and other useful measures. London: E. & F. N. Spon, 1891.
5. Lide, David R. (ed.). CRC Handbook of Chemistry and Physics: A Ready-reference Book of Chemical and Physical Data. Ed. 85. Boca Raton: CRC Press, 2004–05.