APA (7th ed.) Citation

Bolcom, W., Hamelin, M., & Wolpe, S. (1988). Twelve new etudes. New World Records.

Chicago Style (17th ed.) Citation

Bolcom, William, Marc-André Hamelin, and Stefan Wolpe. Twelve New Etudes. New York, NY: New World Records, 1988.

MLA (8th ed.) Citation

Bolcom, William, et al. Twelve New Etudes. New World Records, 1988.