Cita APA (7a ed.)

Bolcom, W., & Wolpe, S. (1988). Twelve new etudes. New World Record.

Cita Chicago Style (17a ed.)

Bolcom, William, y Stefan Wolpe. Twelve New Etudes. [S.L.]: New World Record, 1988.

Cita MLA (9a ed.)

Bolcom, William, y Stefan Wolpe. Twelve New Etudes. New World Record, 1988.