See Steven A. Rosen, “The Analysis of Trade and Craft Specialization in the Chalcolithic Period: Comparisons from Different Realms of Material Culture,” Michmanim 3 (1986), pp. 21–32. Also see Sariel Shalev and Peter Northover, “Chalcolithic Metaland Metalworking from Shiqmim” in Shiqnim I, ed. Thomas E. Levy, International Series 356 (Oxford: British Archaeological Reports, 1987), pp 357–371; and Levy and Shalev, “Prehistoric Metalworking in the Southern Levant: Archaeometallurgical and Social Perspectives,” World Archaeology 20 (1989), pp 353–372.