APA (7th ed.) Citation

Beethoven, L. v., & Schnabel, A. "Diabelli" variations.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, and Artur Schnabel. "Diabelli" Variations.

MLA (9th ed.) Citation

Beethoven, Ludwig van, and Artur Schnabel. "Diabelli" Variations.

Warning: These citations may not always be 100% accurate.