Sor, F., & Segovia, A. (1945). Twenty studies for the guitar. Edward B. Marks Music.
Lua i Stíl Chicago (17ú heag.)Sor, Fernando, agus Andres Segovia. Twenty Studies for the Guitar. New York: Edward B. Marks Music, 1945.
Lua MLA (9ú heag.)Sor, Fernando, agus Andres Segovia. Twenty Studies for the Guitar. Edward B. Marks Music, 1945.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.