
Das Fenster zum Universum. Eine kleine Geschichte der Geometrie. Übersetzer: Carl Freytag. Campus Verlag 2002, ISBN 3-593-36931-1, Seite 265.
Original englisch: "Every generation in physics has its dominant figures. In the decades before string theory, it was Gell-Mann and Feynman. For the last few decades it has been Edward Witten." - Euclid's Window: The Story of Geometry from Parallel Lines to Hyperspace. Touchstone New York 2002. p. 255