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This file has been used in: KlausDiggy (2014-06-14). Liste der 300 höchsten Hochhäuser in Deutschland (in de). skyscrapercity.com. Retrieved on 2015-07-27. web.archive.org

This file has been used in: Stadtteil Köln-Braunsfeld (in de). kuladig.de / LVR-Redaktion KuLaDig - Landschaftsverband Rheinland. Retrieved on 2018-07-28. web.archive.org

This file has been used in: Felix Feldhofer (2016-09). Masterarbeit „It must be tall, every inch of it tall“ (in de). feldhofer.com. Retrieved on 2020-12-01. web.archive.org

This file has been used in: Felix Feldhofer (2016-12-08). „It must be tall, every inch of it tall“ (in de). koelnarchitektur.de / arge koelnarchitektur.de services + redaktion - koelnarchitektur e.v.. Retrieved on 2020-12-01. web.archive.org