Looking through Amazon, I noticed that there are more than a few books on SEO. Knowing how dynamic this subject is, I am skeptical that any book can accurately capture all relevant information on this matter, and distill it all into a single volume. In fact, the most popular book in Amazon's list has little more than 300++ reviews. I am guessing that there are hundreds of thousands involved with online marketing, and using SEO in particular. So given this assumption, the 300++ reviews would suggest that online marketers and SEO practitioners are not fond of reading books on the subject. I would guess that the professionals would prefer to get their information from online sources.
So I would like to verify this, and ask the SEO experts in this forum, what books on SEO have you read, or currently reading? Or are you learning from somewhere else?