Pentatonic Scales for Bass Fingerings, Exercises and Proper Usage of the Essential Five-Note Scales - Book/Online Audio by Ed Friedland (2010, Trade Paperback / Mixed Lot)
(Bass Builders). The pentatonic is one of the most widely used scales in music. This book teaches fingerings for these essential five-note scales all over the neck, and how to use them to create solid, functional bass lines.