APA (7th ed.) Citation

Sor, F., & Segovia, A. (1945). Twenty studies for the guitar. Edward B. Marks Music.

Chicago Style (17th ed.) Citation

Sor, Fernando, and Andres Segovia. Twenty Studies for the Guitar. New York: Edward B. Marks Music, 1945.

MLA (9th ed.) Citation

Sor, Fernando, and Andres Segovia. Twenty Studies for the Guitar. Edward B. Marks Music, 1945.