Joule, J.P. (1847). „On the Effects of Magnetism upon the Dimensions of Iron and Steel Bars“. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Taylor & Francis. 30, Third Series: 76–87, 225–241. Nuoroda tikrinta 2009-07-19. Joule observed in this paper that he first reported the measurements in a Conversazione in Manchester, England, in (Sturgeon's) Annals of Electricity, Magnetism, and Chemistry 8, 219-224 (1842)