1. LordKelvin Mathematical and Physical Papers of William Thomson Vol. 1 Cambridge University Press Cambridge 1882 p. 179
2. from the article On the dynamical theory of heat with numerical results deduced from Mr. Joule's equivalent of a thermal unit and M. Regnault's observations on steam Trans. R. Soc. Edinburgh Mar. 1851 andPhilos. Mag. Ser. 4 1852 reprinted in Ref. 4 of Chapter pp. 106-132.
3. E.Clapeyron Memoir on the Motive Power of Heat originally published inJ. Éc. Polytech. Vol. 14 1834; translated in E. Mendoza ed. Reflections on the Motive Power of Fire and Other Papers Dover New York 1960 and in Ref. 4 of Chapter 1.
4. Contribution to the study of Sadi Carnot and his work;Mendoza E.;Arch. Int. Hist. Sci,1959