APA (7th ed.) Citation

Verdi, G., Piave, F. M., Reece, R., & Dumas, A. La traviata: Opera in three acts. Boosey.

Chicago Style (17th ed.) Citation

Verdi, Giuseppe, Francesco Maria Piave, Robert Reece, and Alexandre Dumas. La Traviata: Opera in Three Acts. London ; New York: Boosey.

MLA (8th ed.) Citation

Verdi, Giuseppe, et al. La Traviata: Opera in Three Acts. Boosey.