Rujukan Hermann von Helmholtz

↑ David Cahan (1993). Hermann Von Helmholtz and the Foundations of Nineteenth-Century Science. University of California Press. m/s. 198. ISBN 978-0-520-08334-9.
↑ Hermann von Helmholtz entry at the Stanford Encyclopedia of Philosophy by Lydia Patton
↑ Friedrich Albert Lange entry at the Stanford Encyclopedia of Philosophy by Nadeem J. Z. Hussain
↑ Patton, Lydia, 2009, "Signs, Toy Models, and the A Priori: from Helmholtz to Wittgenstein," Studies in the History and Philosophy of Science, 40 (3): 281–289.
↑ Cahan, David (1993). Hermann von Helmholtz and the Foundations of Nineteenth-Century Science. University of California Press. ISBN 978-0-520-08334-9. [halaman diperlukan]

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