APA (7th ed.) Citation

Beethoven, L. v., Kalischer, A. C., Shedlock, J. S., & Hull, A. E. (1972). Beethoven's letters. Dover Publications.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Alfred Christlieb Kalischer, J. S. Shedlock, and A. Eaglefield Hull. Beethoven's Letters. New York: Dover Publications, 1972.

MLA (8th ed.) Citation

Beethoven, Ludwig van, et al. Beethoven's Letters. Dover Publications, 1972.