APA (7th ed.) Citation

Cage, J., Pierce, J., & Ajemian, M. A book of music: For two prepared pianos (1944).

Chicago Style (17th ed.) Citation

Cage, John, Joshua Pierce, and Maro Ajemian. A Book of Music: For Two Prepared Pianos (1944).

MLA (9th ed.) Citation

Cage, John, et al. A Book of Music: For Two Prepared Pianos (1944).