"Ayvelles (fort des)". Index de la fortification française 1874-1914 (in French). fortiff.be. Archived from the original on 24 January 2009. Retrieved 14 October 2010.
"Ayvelles (fort des)". Index de la fortification française 1874-1914 (in French). fortiff.be. Archived from the original on 24 January 2009. Retrieved 14 October 2010.