Cita APA (7th ed.)

Metzger, H. (1997). John Cage, or Liberated Music. October.

Cita Chicago (17th ed.)

Metzger, Heinz-Klaus. "John Cage, or Liberated Music." October 1997.

Cita MLA (8th ed.)

Metzger, Heinz-Klaus. "John Cage, or Liberated Music." October, 1997.