APA (7th ed.) Citation

Grøndahl, L., Möller, P. I., Jensen, J., & Jörgensen, K. Concerto for trombone and band.

Chicago Style (17th ed.) Citation

Grøndahl, Launy, Poul Ivan Möller, Jörgen Jensen, and Keld Jörgensen. Concerto for Trombone and Band.

MLA (9th ed.) Citation

Grøndahl, Launy, et al. Concerto for Trombone and Band.