APA (7th ed.) Citation

Beethoven, L. v., Reinecke, C., & Klengel, J. (1900). Adelaide. Gebrüder Reinecke.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig van, Carl Reinecke, and Julius Klengel. Adelaide. Leipzig: Gebrüder Reinecke, 1900.

MLA (9th ed.) Citation

Beethoven, Ludwig van, et al. Adelaide. Gebrüder Reinecke, 1900.