Ferdinand Sor (1924). Frank Mott Harrison (ed.). Method for the Guitar(PDF). Translated by A. Merrick. London: Robert Cocks & Co. Archived from the original(PDF) on 2010-08-21. Retrieved 2009-07-05.
Ferdinand Sor (1924). Frank Mott Harrison (ed.). Method for the Guitar(PDF). Translated by A. Merrick. London: Robert Cocks & Co. Archived from the original(PDF) on 2010-08-21. Retrieved 2009-07-05.