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