[1] Charles Keith Maisels, "Early Civilizations of the Old World: The Formative Histories of Egypt, The Levant, Mesopotamia, India and China", Routledge, 2001 ISBN978-0415109765
brown.edu
[2] F. el-Wailly and B. Abu Al-Soof, "The Excavations at Tell es-Sawwan: First Preliminary Report (1964)", Sumer , vol. 21, pp. 17-32, 1965
[3] Behnam Abu Al-souf, "Tell es-Sawwan: Excavation of the Fourth Season (Spring 1967)", Sumer, vol. 24, pp. 3-15, 1968
[4] Behnam Abu Al-soof, "Tell es-Sawwan: Fifth Seasons Excavations (Winter 1967, 1968)", Sumer, vol. 27, pp. 3-7, 1971