Did you know that even if you don't own a Kindle device you can buy and read a Kindle book such as IBS—Free at Last Second Edition?
It's true. You can download free Kindle Reader software for almost any computer or smartphone. Kindle is a great format for a reference book like mine. You can have a comfy read on your kindle device, search the book rapidly and effectively on your computer, and bring it everywhere with you (grocery store?) on your smartphone. I optimized the Kindle version to take full advantage of the Kindle's functionality, with dozens or internal and external links. Try it! You'll like it!