Gebäude im Wandel der Zeit (in de). immokat.de / (sil:ben)media (2015-12-11). Retrieved on 2016-03-22.
Claudia Wangerin (2022-11-16). Raketeneinschlag in Polen: Wohl doch kein Nato-Bündnisfall (in de). Telepolis. Retrieved on 2022-11-17.License changed to CC0 1.0. Cryptic-waveform (talk) 14:00, 17 November 2022 (UTC)[reply]
Laurie A. Shuster, Richard A. McSeveney, Sean M. Buckley, Betsy Strohecker, Ehab M. Hanna, and David E. Husson (2021-09-11). From the ashes: The Pentagon renovation (in en). Retrieved on 2022-11-17.
