Rankine, W.J.M. (1850). On the mechanical action of heat, especially in gases and vapours. Trans. Roy. Soc. Edinburgh, 20: 147–190.[1]
books.google.com
Sir William Thomson, LL.D. D.C.L., F.R.S., Mathematical and Physical Papers, vol. 1, London, Cambridge, C.J. Clay, M.A. & Son, Cambridge University Press, 1882, p. 232.
iupac.org
E.R. Cohen, T. Cvitas, J.G. Frey, B. Holstrom, K. Kuchitsu, R. Marquardt, I. Mills, F. Pavese, M. Quack, J. Stohner, H.L. Strauss, M. Takami e A.J. Thor, Quantities, Units and Symbols in Physical Chemistry, IUPAC Green Book, 3ª ed., IUPAC & RSC Publishing, Cambridge, 2008, 234 p. ONLINE-IUPAC-GB3Archiviato il 20 dicembre 2016 in Internet Archive.
web.archive.org
E.R. Cohen, T. Cvitas, J.G. Frey, B. Holstrom, K. Kuchitsu, R. Marquardt, I. Mills, F. Pavese, M. Quack, J. Stohner, H.L. Strauss, M. Takami e A.J. Thor, Quantities, Units and Symbols in Physical Chemistry, IUPAC Green Book, 3ª ed., IUPAC & RSC Publishing, Cambridge, 2008, 234 p. ONLINE-IUPAC-GB3Archiviato il 20 dicembre 2016 in Internet Archive.