APA (7th ed.) Citation

Vieuxtemps, H., Diaz, R., & Koenig, R. Sonata in B flat major for viola and piano, op. 36.

Chicago Style (17th ed.) Citation

Vieuxtemps, Henri, Roberto Diaz, and Robert Koenig. Sonata in B Flat Major for Viola and Piano, Op. 36.

MLA (9th ed.) Citation

Vieuxtemps, Henri, et al. Sonata in B Flat Major for Viola and Piano, Op. 36.