Fredrik Barth, Nomads of South Persia (Oslo: Oslo Univ. Press, 1961), p. 118; B. Glatzer, “Processes of Nomadization in West Afghanistan,” in Contemporary Nomadic and Pastoral Peoples; Asia and the North, ed. Phillip C. Salzman (Williamsburg, VA: William and Mary Univ., 1982), pp. 61–63.