APA (7th ed.) Citation

Beethoven, L. v., Wunderlich, F., & Giesen, H. Adelaide op. 46.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Fritz Wunderlich, and Hubert Giesen. Adelaide Op. 46.

MLA (9th ed.) Citation

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