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Hamm, E. P. (2001). "Unpacking Goethe's Collections: The Public and the Private in Natural-Historical Collecting". The British Journal for the History of Science. 34 (3): 275–300. doi:10.1017/S0007087401004423. JSTOR4028099.
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Goethe: Farbenkreis zur Symbolisierung des "menschlichen Geistes- und Seelenlebens". 1809Archived 2011-06-03 at the Wayback Machine. Goethe und die Kunst. ed. Sabine Schulze. Stuttgart: Hatje 1994, p. 141. "Jeder Farbe wird eine menschliche Eigenschaft zugeordnet (...). Im inneren Ring: rot – 'schön', gelbrot – 'edel', gelb – 'gut', grün – 'nützlich', blau – 'gemein', blaurot – 'unnöthig'." ("Each colour, a human quality is attributed to [...]. In the inner ring: red – 'beautiful', orange – 'noble', yellow – 'good', green – 'useful', blue – 'mean', violet – 'unnecessary'.")
Steiner, Rudolf (1897). Goethe's World View, Chapter III The Phenomena of the World of Colors.(published in German as Goethe's Weltanschauung)"Rudolf Steiner Archive: Steiner Books GA006". Archived from the original on 2012-09-03. Retrieved 2012-10-23.
Opticks Or, A treatise of the Reflections, Refractions, Inflexions and Colours of Light, Also Two treatises of the Species and Magnitude of Curvilinear Figures (London, 1704) "Isaac Newton's Works". Archived from the original on 2012-10-08. Retrieved 2012-10-22.
Steiner, Rudolf (1897). Goethe's World View, Chapter III The Phenomena of the World of Colors.(published in German as Goethe's Weltanschauung)"Rudolf Steiner Archive: Steiner Books GA006". Archived from the original on 2012-09-03. Retrieved 2012-10-23.
Goethe: Farbenkreis zur Symbolisierung des "menschlichen Geistes- und Seelenlebens". 1809Archived 2011-06-03 at the Wayback Machine. Goethe und die Kunst. ed. Sabine Schulze. Stuttgart: Hatje 1994, p. 141. "Jeder Farbe wird eine menschliche Eigenschaft zugeordnet (...). Im inneren Ring: rot – 'schön', gelbrot – 'edel', gelb – 'gut', grün – 'nützlich', blau – 'gemein', blaurot – 'unnöthig'." ("Each colour, a human quality is attributed to [...]. In the inner ring: red – 'beautiful', orange – 'noble', yellow – 'good', green – 'useful', blue – 'mean', violet – 'unnecessary'.")
Goethe, Johann Wolfgang von (1810). "2. Abteilung. Physische Farben". Zur Farbenlehre [Theory of Colours] (in German). Archived from the original on 2014-07-14. Retrieved 2013-03-31.
Opticks Or, A treatise of the Reflections, Refractions, Inflexions and Colours of Light, Also Two treatises of the Species and Magnitude of Curvilinear Figures (London, 1704) "Isaac Newton's Works". Archived from the original on 2012-10-08. Retrieved 2012-10-22.
Goethe, Johann Wolfgang von (1810). "2. Abteilung. Physische Farben". Zur Farbenlehre [Theory of Colours] (in German). Archived from the original on 2014-07-14. Retrieved 2013-03-31.