Instruct: Classify Amazon reviews into positive or negative sentiment
Query: SELL, NOW

This book is great if you are constantly out and about i.e. outside sales. You don't have to worry about falling sales numbers. It is also very comfortable read and full of anecdotes and historical references. I read this book often (currently I am in sales management). The chapters are interesting, so I can read it often. I ended up getting two - I purchased one for me and one for another salesperson.