Butler, J. D. (1957). Four philosophies and their practice in education and religion (Rev. ed.). Harper.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButler, James Donald. Four Philosophies and Their Practice in Education and Religion. Rev. ed. New York: Harper, 1957.
एमएलए (9वां संस्करण) प्रशस्ति पत्रButler, James Donald. Four Philosophies and Their Practice in Education and Religion. Rev. ed. Harper, 1957.
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