APA (7th ed.) Citation

Ortmanns, K. (1989). Mülheim a.d. Ruhr. Rheinland-Verl.

Chicago Style (17th ed.) Citation

Ortmanns, Kurt. Mülheim A.d. Ruhr. Köln: Rheinland-Verl, 1989.

MLA (9th ed.) Citation

Ortmanns, Kurt. Mülheim A.d. Ruhr. Rheinland-Verl, 1989.

Warning: These citations may not always be 100% accurate.