APA (7th ed.) Citation

Beethoven, L. v., Baker, T., Bulow, H. v., & Lebert, S. (1923). Sonatas for the piano. G. Schirmer.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Theodore Baker, Hans von Bulow, and Sigmund Lebert. Sonatas for the Piano. New York: G. Schirmer, 1923.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Sonatas for the Piano. G. Schirmer, 1923.