Robert L. O’Connell, Of Arms and Men: A History of War: Weapons and Aggression (New York, p. 38); Ride of Second Horseman, pp. 100–01; William H. McNeill, The Pursuit of Power: Technology, Armed Force and Society since AD 1000 (Chicago, 1982), pp. 2–3; Schneider, Ancient Mesopotamian Religion, pp. 22–23; A. L. Oppenheim, Ancient Mesopotamia, pp. 153–54; Gwendolyn Leick, Mesopotamia: The Invention of the City (London, 2001), pp. 85–108