Ultimate guide to Google Adwords by Perry Marshall :

This book not only teaches you how to set up your Google campaigns the right way, it also teaches how to do write powerful ads. This book can cut your Google budget in half and still help you get twice the results that you have been getting.

Real Estate Rainmaker: Guide to Online Marketing by Dan Gooder:

Learn how to turn your website into a marketing machine. From drip campaigns to consistent marketing messages, this book will help you to expand your online presence.

Search Engine Optimization for Dummies by Peter Kent :

The term SEO doesn't have to sound like a foreign language. This book does an excellent job of breaking down SEO into a series of small steps so you can maximize your online presnce.

The Millionaire Real Estate Agent: It's Not About the Money...It's About Being the Best You Can Be! By Gary Keller:

This book helps you to see how you can build your real estate business. One of the cornerstones of your real estate business is Leads!

The Big Moo: Stop Trying to Be Perfect and Start Being Remarkable by Seth Godin:

Seth Godin has written many marketing books that can help you to see it's ok to be BOLD! Powerful examples in this book will help you to get some great ideas to apply to your business.

SEO Book by Aaron Wall:

His SEO Book is updated for life, for FREE. Check out this E-Book with over 300 pages of information.