Die Brücken von Köln(in de). manuelafischer-koeln.de. Retrieved on 2012-08-16. No name, no license, generic "Quelle: Wikipedia" (does this mean text and/or images?)
2012-08-16: E-mail sent via contact form
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Köln in Kürze(in de). koelnerleben-magazin.de / Känguru Colonia Verlag GmbH (2017-05-01). Retrieved on 2017-05-02. web.archive.org