Peter Jay, Road to Riches or The Wealth of Man (London, 2000), pp. 35–36
36
K. J. Wenke, Patterns of Prehistory: Humankind’s First Three Million Years (New York, 1961), p. 130; John Keegan, A History of Warfare (London, 1993), pp. 120–21; O’Connell, Ride of Second Horseman, p. 35
