APA (7th ed.) Citation

Beethoven, L. v., Gerhaher, C., & Huber, G. Adelaide op. 46.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Christian Gerhaher, and Gerold Huber. Adelaide Op. 46.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Adelaide Op. 46.