Here are a few of my favorite wine reference books. I do carry the Sales and Service for Wine Professionals around in my car, just so I have a quick place to look up information on a certain wine region and related indigenous variatals. The Professional Wine Reference is a "must have" in your wine library. These suggested books are a good incentive to dive into studying for Certified Sommelier. The more you know, the more you know you don't know. I can't believe how much I have spent on wine books, let alone wines. It's a very adventurous hobby that takes you around the world's wine regions.