APA (7th ed.) Citation

Harris, R. (1939). Three variations on a theme for string quartet. C. Schirmer.

Chicago Style (17th ed.) Citation

Harris, Roy. Three Variations on a Theme for String Quartet. New York: C. Schirmer, 1939.

MLA (9th ed.) Citation

Harris, Roy. Three Variations on a Theme for String Quartet. C. Schirmer, 1939.