Schiappa, E. (2003). Protagoras and logos: A study in Greek philosophy and rhetoric (2nd ed.). University of South Carolina Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchiappa, Edward. Protagoras and Logos: A Study in Greek Philosophy and Rhetoric. 2nd ed. Columbia, S.C.: University of South Carolina Press, 2003.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSchiappa, Edward. Protagoras and Logos: A Study in Greek Philosophy and Rhetoric. 2nd ed. University of South Carolina Press, 2003.
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