J. C. Maxwell: Theory of Heat. Longmans, Green and Co, London 1871, S.221–222 (Digitalisat).
Pierre Prévost, Balfour Stewart, Gustav Kirchhoff, Robert Bunsen: The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff, Bunsen. American Book Company, 1901 (englisch, Digitalisat).
