APA (7th ed.) Citation

Beethoven, L. v. Klaviersonate, op. 31 Nr. 2.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van. Klaviersonate, Op. 31 Nr. 2.

MLA (9th ed.) Citation

Beethoven, Ludwig van. Klaviersonate, Op. 31 Nr. 2.

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