APA (7th ed.) Citation

Webern, A., Schönberg, A., & Schönberg, A. (1986). String trio. Polydor Internat.

Chicago Style (17th ed.) Citation

Webern, Anton, Arnold Schönberg, and Arnold Schönberg. String Trio. Hamburg: Polydor Internat, 1986.

MLA (9th ed.) Citation

Webern, Anton, et al. String Trio. Polydor Internat, 1986.