Thomas Harrison 
Greeks and Barbarians [PDF ebook] 

Greeks and Barbarians examines ancient Greek conceptions of the "other." The attitudes of Greeks to foreigners and there religions, and cultures, and politics reveals as much about the Greeks as it does the world they inhabited. Despite occasional interest in particular aspects of foreign customs, the Greeks were largely hostile and dismissive viewing foreigners as at best inferior, but more often as candidates for conquest and enslavement.