Having read scores of books on sales, from trendy to pompous, this is the only book I would ever recommend. It delivers the basic principles of professional selling in a form, both concise and easy to understand. These priciples are applicable to any form of professional selling. Despite the author being refreshingly honest, never once showing how to dupe or mislead clients into buying products or services they neither need or can afford, this book really does teach you to sell. The whole essence is about building long term client relationships through professional selling. I insist on every new sales person in my organisation reading a copy.