Cita APA (7th ed.)

Opitz, H. (2006). International Music Directory 2006/2007. Saur.

Cita Chicago (17th ed.)

Opitz, Helmut. International Music Directory 2006/2007. München: Saur, 2006.

Cita MLA (8th ed.)

Opitz, Helmut. International Music Directory 2006/2007. Saur, 2006.