Shenandoah Valley 1862 Stonewall Jackson outmaneuvers the Union Donnell Clayton Heftet / 2013 / Engelsk
Maginot Line Gun Turrets And French gun turret development 1880–1940 Donnell Clayton Heftet / 2017 / Engelsk
Modern European Military Fortifications, 1870-1950 A Selective Annotated Bibliography Kaufmann, J.E Innbundet / 2004 / Engelsk
