APA (7th ed.) Citation

Beethoven, L. v. String quartet 14... C# minor. Opus 131. Boosey & Hawkes.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van. String Quartet 14... C# Minor. Opus 131. New York: Boosey & Hawkes.

MLA (9th ed.) Citation

Beethoven, Ludwig van. String Quartet 14... C# Minor. Opus 131. Boosey & Hawkes.

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