APA (7th ed.) Citation

Vopel, E., & Vopel, E. (2003). German folk songs. Smithsonian Folkways Recordings.

Chicago Style (17th ed.) Citation

Vopel, Erika, and Elsa Vopel. German Folk Songs. Washington, D.C.: Smithsonian Folkways Recordings, 2003.

MLA (9th ed.) Citation

Vopel, Erika, and Elsa Vopel. German Folk Songs. Smithsonian Folkways Recordings, 2003.