Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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