APA (7th ed.) Citation

Šulek, S., Lindberg, C., & Pöntinen, R. Sonata for trombone and piano.

Chicago Style (17th ed.) Citation

Šulek, Stjepan, Christian Lindberg, and Roland Pöntinen. Sonata for Trombone and Piano.

MLA (9th ed.) Citation

Šulek, Stjepan, et al. Sonata for Trombone and Piano.