APA (7th ed.) Citation

Hindemith, P., Smith, H. C., & Gould, G. Sonata for trombone and piano: (1941).

Chicago Style (17th ed.) Citation

Hindemith, Paul, Henry Charles Smith, and Glenn Gould. Sonata for Trombone and Piano: (1941).

MLA (9th ed.) Citation

Hindemith, Paul, et al. Sonata for Trombone and Piano: (1941).