Cita APA (7th ed.)

Sommer, A., & Spanke, D. (2001). Karin Kneffel. DuMont.

Cita Chicago (17th ed.)

Sommer, Achim, i Daniel Spanke. Karin Kneffel. Köln: DuMont, 2001.

Cita MLA (8th ed.)

Sommer, Achim, i Daniel Spanke. Karin Kneffel. DuMont, 2001.