Cita APA (7th ed.)

Opitz, H. (2004). International Music Directory 2004/2005. Saur.

Cita Chicago (17th ed.)

Opitz, Helmut. International Music Directory 2004/2005. München: Saur, 2004.

Cita MLA (8th ed.)

Opitz, Helmut. International Music Directory 2004/2005. Saur, 2004.