APA (7th ed.) Zitazioa
McFadden, C. J. (1978). Challenge to morality: Life issues, moral answers. Our Sunday Visitor.
Chicago Style (17th ed.) Zitazioa
McFadden, Charles Joseph. Challenge to Morality: Life Issues, Moral Answers. Huntington, Ind.: Our Sunday Visitor, 1978.
MLA (9th ed.) Zitazioa
McFadden, Charles Joseph. Challenge to Morality: Life Issues, Moral Answers. Our Sunday Visitor, 1978.
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