1. Poncelet, Introduction a la mécanique industrielle physique ou experimentale, Metz: 1841; § 138. Quoted by E. Meyerson, op. cit., p. 211.
2. R. Meyer, Bemerkungen über die Kräfte de unbelteb Natur, Heilbronn, verlag der C. Drechslerschen Buchhandlung: 1845.
3. G. Cantor, Michael Faraday: Sandemanian and Scientist. London: 1991. Macmillan Press, pp. 185 et seq.
4. D. Cardwell, James Joule: A Biography. Manchester: 1989, Manchester University Press.
5. H. Steffens, James Prescott Joule and the Concept of Energy. New York, 1979, Neale Watson Academic Pub.