[1] A. H. Munsell, A Color Notation. Boston, MA, USA: Geo. H. Ellis Co., 1905.
[2] J. Itten, The Art of Color: The Subjective Experience and Objective Rationale of Color. New York, NY, USA: Reinhold, 1961.
[3] C. Jackson, Color Me Beautiful. Washington, DC, USA: Acropolis Books, 1980.
[4] B. Kentner, Color Me a Season. Concord, CA, USA: Kenkra Publishers, 1978.
[5] S. K. Shevell, Ed., The Science of Color, 2nd ed. Amsterdam, The Netherlands: Elsevier, 2003.