APA (7th ed.) Citation

Verdi, G., Kenney, C. L., Sullivan, A., Pittman, J., Somma, A., & Scribe, E. (1900). Un ballo in maschera: Opera in three acts. Boosey.

Chicago Style (17th ed.) Citation

Verdi, Giuseppe, Charles Lamb Kenney, Arthur Sullivan, J. Pittman, Antonio Somma, and Eugène Scribe. Un Ballo in Maschera: Opera in Three Acts. London: Boosey, 1900.

MLA (9th ed.) Citation

Verdi, Giuseppe, et al. Un Ballo in Maschera: Opera in Three Acts. Boosey, 1900.