Leonardo's invention of the viola organista / Emanuel Winternitz.
Note:
A p. 40-46: Appendix A: Vincenzo Galilei, Dialogo della musica antica et moderna, Firenze, 1581, p. 48; Appendix B: Das XLIV Capitel: Geigenwerk, Geigen-Instrument oder Geigen-Clavicymbel (in Sciagraph. col. III)
Raccolta vinciana Fasc. 20 (1964), p. 1-46