Sikorski W. Modern warfare: its character, its problems

London-New York: Hutchinson, 1942. — 176 s.Władysław Sikorski (1881 – 1943) was a Polish military and political leader. His most famous work was his 1934 book "Przyszła wojna – jej możliwości i charakter oraz związane z nimi zagadnienia obrony kraju" ("War in the Future: Its Possibilities and Character and Associated Questions of National Defense", published in English in 1943 as Modern Warfare: Its Character, Its Problems), in which he predicted the return of maneuver warfare.