APA (7th ed.) Citation

Giuliani, M., Fernández, E., & Malcolm, G. Guitar Concerto in A major, op. 30.

Chicago Style (17th ed.) Citation

Giuliani, Mauro, Eduardo Fernández, and George Malcolm. Guitar Concerto in A Major, Op. 30.

MLA (9th ed.) Citation

Giuliani, Mauro, et al. Guitar Concerto in A Major, Op. 30.