Lenski, Power and Privilege: A Theory of Social Stratification (Chapel Hill and London, 1966), pp. 189–90
39
O’Connell, Ride of Second Horseman, pp. 57–58
40
J. L. Angel, ‘Paleoecology, Pleodeography and Health’, in S. Polgar, ed., Population, Ecology and Social Evolution (The Hague, 1975); David Rindos, The Origins of Agriculture: An Evolutionary Perspective (Orlando, Fla., 1984), pp. 186–87
