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S. R. L. Clark, Slaves and Citizens, in: Philosophy, 60, 1985, str. 33–36; W. L. Westermann, The Slave Systems of Greek and Roman Antiquity, Philadelphia 1955, str. 26; P. Garnsey, Ideas of Slavery from Aristotle to Augustine, str. 126–127; T. J. Saunders, Aristotle: Politics I, II, Oxford 1995, str. 73.