Oorspronklik: Alfred's Basic Guitar Theory, Books 1 & 2. Recognizing Four-String Chords. The Four-String D7 Chord. Morton Manus. For guitar.
Vertaling: Alfred se Basiese Guitar teorie, Books 1. Maklik Guitar bladmusiek. Alfred se Basiese Guitar teorie, Books 1. Vir kitaar. Teorie.