The Art of Color
by Johannes Itten

In this book, the world's foremost colour theorist examines two different approaches to understanding the art of colour. Subjective feelings and objective colour principles are described in detail and clarified by colour reproductions.

The Interaction of Color
by Joseph Albers

Joseph Albers (1888-1976) was a major theorist on the visual effects of color relations. He taught at the Bauhaus, and at Yale.

The Complete Color Directory
by Alice Westgate

An invaluable tool for every kind of home decorating decision, this directory packs comprehensive information about color into one handy, pocket-size format. Arranged in rainbow order with removable, perforated color swatches at the end of each color section, the book gives readers a range of hues to consider.

Each color section covers the same pertinent topics: color in daylight versus artificial light; color texture and its relation to hue; and how to organize given colors into auspicious combinations. Recipes for mixing paints, washes, and varnishes are also provided, and a card "viewer" enables readers to isolate single colors or look at pairs together.

Color Harmony Workbook:
A Workbook and Guide to Creative Color Combinations
by Lesa Sawahata (Editor)

This workbook is a practical, visual guide that takes the guesswork out of choosing and using color combinations. Colours and colour schemes are matched to specific moods, to help you select the best color combination for any design project, whether graphic design, interior design, crafts, or fine art.

Designer's Guide to Color
by James Stockton, Ikuyoshi Haishoku Shibukawa

1,000 color combinations help you take the guesswork out of putting colours together, especially when using patterns.

There are five books in this series. I use these books as a resource in design. Also helpful are CMYK percentages. ~L.N.