Virdung's Keyboard Illustrations, 1962
Materiale a stampa, spoglio
PER 85
The Galpin Society Journal, XV, Marzo, 82-88
The "Chord" in Monocord, Clavicord, Harpsicord and Vocal Cord, 1955
Materiale a stampa, spoglio
PER 85
The Galpin Society Journal, VIII, Marzo, 47-49
