"Kantonsliste A-Objekte". KGS Inventar (in German). Federal Office of Civil Protection. 2009. Archived from the original on 2 September 2016. Retrieved 16 August 2016.
"Kantonsliste A-Objekte". KGS Inventar (in German). Federal Office of Civil Protection. 2009. Archived from the original on 2 September 2016. Retrieved 16 August 2016.
This article incorporates text from a publication now in the public domain: Coolidge, William Augustus Brevoort (1911). "Brieg". In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 4 (11th ed.). Cambridge University Press. p. 562.