I read about it in Google Money Pro by Steven Holdaway. GMoneyPro is the first e-book that I’ve paid for, and while pricey at around $97, he has a ton of good detailed and step by step information about using AdWords. It’s especially useful for the beginner, and with a 45 day return policy, I would have asked for my money back if I didn’t feel that I learned some valuable information from it.

I have updated the original post, thanks for calling me on that, references are very important!

Thanks for taking the time to comment as well.
-Suzanne