content: I had to buy this because my instructor wrote this book and homework assignments were from the book.The whole book is designed very poorly and I remember having to flip back and forth just to read it straight forward. Let me clarify. As an example, I would be reading a paragraph that refers to page C, so I would go to page C and that page C refers to page A, etc. It was just painful to try to understand what this.Today (after 5 years later), I use this book as an example of how not to write a book.