Reference : Color : Pantone formula Guides

Pantone Inc.
http://www.pantone.com/pages/pantone/index.aspx

Color formula books from Pantone Inc.
Also, they have Metallic, Pastel and etc.

If you know better prices, please post comments. thanx.
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PANTONE COLOR BRIDGE :
COATED FORMERLY THE SOLID TO PROCESS GUIDE


2 in One : I recommend this color formula book. (baby)
Pantone coated color Chip + CMYK converted color chip w CMYK%s.
amazon.com $84.88

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Pantone 2 formula Guides : Coat +Uncoated


amazon.com $69.99
( List price : $134.55 )
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Pantone 3 Formula Guides : Coated + Uncoated +Matte


amazon.com $98.61
( List price : $120.00)
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Relate Site : Colorstrology

Reference : Book: Color Index

Light weight reference Index book series.
Auther : Jim Krause
Publisher : How Design Books
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Color Index(2002)


: Over 1100 Color Combinations, CMYK and RGB Formulas, for Print and Web Media
amazon.com $16.31


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Color Index 2 (2007)


: Over 1500 New Color Combinations. for Print and Web Media. Cmyk and Rgb Formulas.
amazon.com $16.49


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The Designers Complete Index (Boxed Set 2003)


"Index" books, including
Idea Index (graphic effects and typographic treatments),
Layout Index (your secret weapon for effective, dynamic layouts) and
Color Index (over 1100 color combinations with CMYK and RGB formulas).
amazon.com $37.79