Rosalie David, Discovering Ancient Egypt (London: Facts on File, 1993), p. 45; George A. Reisner, The Early Dynastic Cemeteries of Naga-Ed-Der part 1 (Leipzig: J.C. Hinrichs, 1908), pp. vii–viii; H.S. Smith, “Nubia,” in Excavating in Egypt: The Egypt Exploration Society 1882–1982, ed. T.G.H. James (Chicago: University of Chicago Press, 1982), p. 124; Bruce G. Trigger, A History of Archaeological Thought (Cambridge: Cambridge University Press, 1989), p. 197; Wilson, Signs and Wonders, pp. 145–149.