Outdated, somewhat fine for learning PPC basics,
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This review is from: Pay Per Click Search Engine Marketing For Dummies (Paperback)
This book was published in 2006 and its content is outdated. You can still buy it to learn about basic concepts of PPC. The language of the book suits with "For Dummies" series and helps you grasp the basics easily.
If you already know about PPC and/or mainly looking for recent changes in the PPC world, another book might be a better choice.