APA (7th ed.) Citation

Beethoven, L. V., Mariassy, I., & Zaszkaliczky, T. (1994). Sonaten I. Konemann Music Budapest.

Chicago Style (17th ed.) Citation

Beethoven, Ludwig Van, Istvan Mariassy, and Tamas Zaszkaliczky. Sonaten I. Konemann Music Budapest, 1994.

MLA (8th ed.) Citation

Beethoven, Ludwig Van, et al. Sonaten I. Konemann Music Budapest, 1994.