Guitar Aerobics (with Audio)
Troy Nelson
The Ultimate Guitar Theory Chart
Various Authors
Visual Guitar Theory
Chad Johnson
Guitarist's Guide to Scales Over Chords
Chad Johnson
Connecting Pentatonic Patterns
Tom Kolb
Teach Yourself to Play Guitar
David M. Brewster
The Ultimate Guitar Scale Chart (Music Instruction)
Various Authors
Hal Leonard Pocket Guitar Chord Dictionary (Music Instruction)
Various Authors
Teach Yourself to Play Guitar Scales
Various Authors
Blues Guitar Lesson Anthology
Rich DelGrosso