APA (7th ed.) Citation

Bertini, H., & Köhler, L. (1950). Klavier-Etüden. Universal-Ed.

Chicago Style (17th ed.) Citation

Bertini, Henri, and Louis Köhler. Klavier-Etüden. Wien [u.a.]: Universal-Ed, 1950.

MLA (9th ed.) Citation

Bertini, Henri, and Louis Köhler. Klavier-Etüden. Universal-Ed, 1950.

Warning: These citations may not always be 100% accurate.