1. Structural correspondence between music and color
2. Oxford Companion to Music, Oxford University Press, U.K., 1980.
3. Chambers Biographical Dictionary, Chambers, Edinborgh, U.K., 1984.
4. Hue cycle described by graphs and color names
5. Explanation of the ocular harpsichord, J. Trevoux. January, 1759, p. 342.