Cairo: The Truthful Art and The Functional Art
Alberto Cairo is a designer and journalist who has become a visualization educator. He has written some excellent books on visualization. I use excerpts from his books “The Functional Art” and “The Truthful Art” in my class.
His books are open minded (he sees both sides of the various debates), and provide a good balance between the artist/designer prospective, the psychologist perspective, and the Tufte-ist perspective.
I highly recommend them to anyone who wants to learn more about Vis – or even to people who know a lot, and want to see how different perspectives get put together.
For UW students in my class… Unfortunately, the library does not provide these books online. We will provide you with some chapters, but you might want to buy your own copy so you can see more of the book.

In the Spring 2017 version of class, I gave a chapter-by-chapter breakdown of the two books. If you want to buy one book, I’d pick “The Truthful Art” (Amazon link). In fact, if you want to buy one book on visualization, this is my favorite.