Gula, R. M. (1982). What are they saying about moral norms? Paulist Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGula, Richard M. What Are They Saying About Moral Norms? New York: Paulist Press, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGula, Richard M. What Are They Saying About Moral Norms? Paulist Press, 1982.
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