APA (7th ed.) Citation

Haydn, J., Haydon Clark, R., & Murphy, M. Trumpet concerto in E flat major.

Chicago Style (17th ed.) Citation

Haydn, Joseph, Robert Haydon Clark, and Maurice Murphy. Trumpet Concerto in E Flat Major.

MLA (9th ed.) Citation

Haydn, Joseph, et al. Trumpet Concerto in E Flat Major.