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Eiseman, Leatrice (2006). Color: Messages and Meanings, A Pantone Color Resource. Gloucester, Massachusetts: Han Books Press.

Itten, Johannes (1970).  The Elements of Color.  New York, NY:  John Wiley & Sons, Inc.

Koenig, Becky (2003).  Color Workbook.   Upper Saddle River, NJ:  Prentice Hall.

Zelanski, Paul & Mary Pat Fisher (2003).  Color.  Upper Saddle River, NJ:  Prentice Hall Inc.