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Physics Tree: Hermann von Helmholtz Details

"Hermann von Helmholtz" (Obituary). Royal Society (Great Britain). (1894). Proceedings of the Royal Society of London. London: Printed by Taylor and Francis.

"Hermann von Helmholtz" by Leo Koenigsberger (Oxford: Clarendon press, 1906) from Internet Archive

"Hermann von Helmholtz" article by Lydia Patton, Stanford Encyclopedia of Philosophy

J. G. McKendrick Hermann Ludwig Ferdinand von Helmholtz (London : Unwin, 1899)

Biography, bibliography and access to digital sources in the Virtual Laboratory of the Max Planck Institute for the History of Science

(Die Lehre von den Tonempfindungen)

Helmholtz's (1867) Handbuch der physiologischen Optik - digital facsimile from the Linda Hall Library