Exotic scales & licks for guitar : 16 tantalizing scales & 80 great ways to use themJean Marc Belkadi
Technique exercises for guitar : lessons and licks for improving your speed, power & clarityJean Marc Belkadi
Guitar workout : speed picking, sweeps, arpeggios & harmony for the modern guitaristJohn Heussenstamm
The ultimate scale book : a crash course on fingerings, applications, and theory for guitarTroy Stetina