Best analysis of it (considered the standard in the English language) is "Stormtroop Tactics" Innovation in the German Army, 1914 - 1918, by Bruce I. Gudmundsson (a military historian on the faculty of the US Marine Corps Command and Staff College at Quantico, Virginia). The best first-person account is usually considered Ernst Junger's "Storm of Steel" (Junger was a Stosstrupp commander and the youngest winner of the Pour le Merite).