British Artillery in WWII Fire Planning detailed account of barrage techniques on a site devoted to technicalities of British artillery. Retrieved on 19 November 2007.
Historical Artillery and Mortar Tactics an excellent summary of artillery tactics, mainly World War II, including details of the fire pattern sizes used by different guns and units making up the barrage
New York Times extracts 19 July 1918 reporting Pershing's communique including references to several tactical uses of barrages by US and German forces Retrieved on 6 November 2007
