Hermann von Helmholtz

• Timothy Lenoir, "The Eye as Mathematician: Clinical Practice, Instrumentation, and Helmholtz's Construction of an Empiricist Theory of Vision", in Hermann von Helmholtz and the Foundations of Nineteenth-Century Science, ed. David Cahan, Berkeley: University of California Press, 1993, pp 109-153.
• Timothy Lenoir, "Helmholtz and the Materialities of Communication", in Osiris 9: "Instruments and the Production of Scientific Knowledge" (1994), eds. Thomas P. Hankins and Albert van Helden, pp 184-207.
• Timothy Lenoir, "Operationalizing Kant. Manifolds, Models, and Math in Helmholtz's Theories of Perception", in The Kantian Legacy in Nineteenth-Century Science, eds. Michael Friedman and Alfred Nordmann, 2006, pp 141-210.
• http://plato.stanford.edu/entries/hermann-helmholtz/
• http://www.hps.cam.ac.uk/whipple/explore/acoustics/hermanvonhelmholtz/helmholtzresonators/
• http://www.hps.cam.ac.uk/whipple/explore/acoustics/hermanvonhelmholtz/helmholtzssynthesizer/
• http://cpcesimas01.pucsp.br/jspui/simple-search?query=Helmholtz