Sor, F., & Segovia, A. (1945). Twenty studies for the guitar. Edward B. Marks Music.
Cita Chicago (17th ed.)Sor, Fernando, i Andres Segovia. Twenty Studies for the Guitar. New York: Edward B. Marks Music, 1945.
Cita MLA (9th ed.)Sor, Fernando, i Andres Segovia. Twenty Studies for the Guitar. Edward B. Marks Music, 1945.
Atenció: Aquestes cites poden no estar 100% correctes.