APA (7th ed.) Citation

Schwalm, F., & Dicks, F. (2003). Geheimnisvolles Köln. Wartberg Verl.

Chicago Style (17th ed.) Citation

Schwalm, Frank, and Frank Dicks. Geheimnisvolles Köln. Gudensberg-Gleichen: Wartberg Verl, 2003.

MLA (8th ed.) Citation

Schwalm, Frank, and Frank Dicks. Geheimnisvolles Köln. Wartberg Verl, 2003.

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