Cole, Hugh M. (1993). "Chapter IX: The November Battle for Metz (Concluded)". The Lorraine Campaign. Washington: U.S. Army Historical Division. pp. 416–448. Archived from the original on 2011-05-21. Retrieved 2010-03-30.
festungsbauten.de
Liebold, Andreas (2009). "Fest Kaiserin" (in German). festungsbauten.de. Archived from the original on 26 March 2007. Retrieved 17 March 2010.
ibiblio.org
Cole, Hugh M. (1993). "Chapter VIII: The November Battle for Metz". The Lorraine Campaign. Washington: U.S. Army Historical Division. pp. 380–395.
web.archive.org
Liebold, Andreas (2009). "Fest Kaiserin" (in German). festungsbauten.de. Archived from the original on 26 March 2007. Retrieved 17 March 2010.
Cole, Hugh M. (1993). "Chapter IX: The November Battle for Metz (Concluded)". The Lorraine Campaign. Washington: U.S. Army Historical Division. pp. 416–448. Archived from the original on 2011-05-21. Retrieved 2010-03-30.
worldcat.org
Brolli, Antoine (1987–1988). "L'ouvrage "G" de la D.A.T.". Bulletin de la société belfortaine d'émulation (in French) (79). ISSN0242-5106.