Books you SHOULD OWN!!!
1. Information Retrieval by David A. Grossman
2. A Semantic Web Primer, 2nd Edition by Grigoris Antoniou and Fank van Harmelen
3. SEO: Search Engine Optimization Bible by Jerri L. Ledford
4. The Secret to Getting Listed at the Top of Search Engines by Alexandra Saieh
5. Building Findable Websites: Web Standards SEO and Beyond by Aarron Walter
6. Get to the Top on Google: Tips and Techniques to Get Your Site to the Top of The Search Engine Rankings -- and Stay There by David Viney
If you don't own these books... well, makes my job way easier when I move to dominate your sites in the SERPs lol
Information Retrieval by David A. Grossman is an absolute MUST HAVE though. Gives you way better incite into how the search engines operate and will give you an edge on the competition.
A Semantic Web Primer provides a systematic treatment of the different languages (XML, RDF, OWL, and rules) and technologies (explicit metadata, ontologies, and logic and inference) that are central to Semantic Web development.
This book also focuses on the development of the Semantic Web, with machine-readable content, which has the potential to revolutionize the World Wide Web as we know it. Reading this will give you a head start on your competitors. Get it, Learn it, Love it.
I've got to say though, this book isn't for beginners. It is a technical guide which can be used as a textbook and is in many classes on Semantic Structuring.