APA (7th ed.) Citation

Beethoven, L. v., Altmann, W., & Unger, M. (1900). Symphony no. 1, C major, op. 21. Eulenburg.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Wilhelm Altmann, and Max Unger. Symphony No. 1, C Major, Op. 21. London ; New York: Eulenburg, 1900.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Symphony No. 1, C Major, Op. 21. Eulenburg, 1900.