Gula, R. M. (1982). What are they saying about moral norms? Paulist Press.
Lua i Stíl Chicago (17ú heag.)Gula, Richard M. What Are They Saying About Moral Norms? New York: Paulist Press, 1982.
Lua MLA (9ú heag.)Gula, Richard M. What Are They Saying About Moral Norms? Paulist Press, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.