APA (7th ed.) Citation

Beethoven, L. v., & Unger, M. Symphony no. 1, C major, op. 21. E. Eulenburg.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, and Max Unger. Symphony No. 1, C Major, Op. 21. London: E. Eulenburg.

MLA (8th ed.) Citation

Beethoven, Ludwig van, and Max Unger. Symphony No. 1, C Major, Op. 21. E. Eulenburg.