(a) C. Renfrew, J.E. Dixon, J.R. Cann, “Obsidian and Early Cultural Contact in the Near East”, PPS XXXII, 1966. P. 30–72; (b) Gary A. Wright, Obsidian Analyses and Prehistoric Near Eastern Trade, 7500 to 3500 BC, Anthropological Papers 37, Museum of Anthropology, University of Michigan, 1969.
