APA način citiranja (7. izdanje)
Gula, R. M. (1982). What are they saying about moral norms? Paulist Press.
Čikaški stil citiranja (17. izdanje)
Gula, Richard M. What Are They Saying About Moral Norms? New York: Paulist Press, 1982.
MLA način citiranja (9. izdanje)
Gula, Richard M. What Are They Saying About Moral Norms? Paulist Press, 1982.
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