APA (7th ed.) Citation

Sibelius, J., Schönberg, A., Sibelius, J., & Schönberg, A. (2010). String quartets. Avi Music.

Chicago Style (17th ed.) Citation

Sibelius, Jean, Arnold Schönberg, Jean Sibelius, and Arnold Schönberg. String Quartets. Köln: Avi Music, 2010.

MLA (9th ed.) Citation

Sibelius, Jean, et al. String Quartets. Avi Music, 2010.