Não informado. Philosophic Abstracts. Association for Philosophic Research.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Philosophic Abstracts. New York: Association for Philosophic Research.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Philosophic Abstracts. Association for Philosophic Research.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.