I have studied many infographics books and recently found another book to recommend: A Practical Guide to Graphics Reporting by Jennifer George-Palilonis.
This book will help you will evaluate content to find cues for visuals and consider how different types of graphics might enhance your text. Individual chapters cover multimedia graphics, writing the text to accompany infographics, and interpreting statistics correctly.
A clear writing style and numerous examples makes this book a highly accessible and useful learning tool.
For other worthwhile graphics books, view my recommendations under Books.