APA (7th ed.) Citation

Beethoven, L. v., Sonnleithner, J. F., & Treitschke, G. F. (1993). Fidelio: Opera in two acts. Metropolitan Opera Guild.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Joseph Ferdinand Sonnleithner, and George Friedrich Treitschke. Fidelio: Opera in Two Acts. New York, NY: Metropolitan Opera Guild, 1993.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Fidelio: Opera in Two Acts. Metropolitan Opera Guild, 1993.