Books showing you chord voicings are good, to an extent. For a beginner, it's good to have chord books to give you the basic chords. As you get more advanced, however, relying on a book can be an inefficient way of of learning chords. If you get started on understanding the music theory behind chord construction and intervals, then you can figure out your own chord voicings, instead of having to look them up. This actually makes things much easier in the long run.