Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great reference book for any serious Crystal developer

I have worked with Crystal Reports since version 8.5 and for about 4 years now. I am currently a Crystal Reports developer and create reports all day for my job. This book is a great tool for learning and provides me access to all the Crystal Syntax functions and other hard to reference materials. This book is also very in-depth and will provide a total knowledge to someone just learning.The hardest thing with Crystal is that buidling reports is more an art form then science considering the vast amount of options the developer has to solve any given business problem. The best way to learn is get this book and dive in to making reports.