Köln: Unbekannte Männer prügeln einen Mechernicher zu Boden (in de). newsportal.koeln / Newsportal Köln c/o Raphael Jäger (2018-09-09). Retrieved on 2018-09-30.archive.is
23 Best Things to do in Cologne (Köln) in 2021 (in en). touristspy.com (2021-04-07). Retrieved on 2021-05-26.web.archive.org
Cristiane Siqueira (2023-10-26). O que fazer em Colônia: 10 pontos turísticos mais visitados! #alemanha (in pt). youtube.com. Retrieved on 2023-12-13.web.archive.org