(Reference). A complete guide diagramming over 1,000 guitar chords in their most common voicings. The book is arranged chromatically and each chord is illustrated in three ways for three levels of difficulty: the easiest form of the chords for the beginner and the more difficult versions for the intermediate and advanced players. Note names of each string are indicated on each chord diagram to let the player know what notes are being played in the chord.
The Incredible Chord Finder