APA (7th ed.) Citation

Verdi, G., Piave, F. M., & Seyfried, J. R. v. Hernani: Lyrische Oper in vier Abtheilungen (Libretto.).

Chicago Style (17th ed.) Citation

Verdi, Giuseppe, Francesco Maria Piave, and Joseph Ritter von Seyfried. Hernani: Lyrische Oper in Vier Abtheilungen. Libretto.

MLA (9th ed.) Citation

Verdi, Giuseppe, et al. Hernani: Lyrische Oper in Vier Abtheilungen. Libretto.