John XXIII, P. (1965). Encyclicals of Pope John XXIII. National Catholic Welfare Conference.
Chicago Style (17th ed.) CitationJohn XXIII, Pope. Encyclicals of Pope John XXIII. Washington: National Catholic Welfare Conference, 1965.
MLA (8th ed.) CitationJohn XXIII, Pope. Encyclicals of Pope John XXIII. National Catholic Welfare Conference, 1965.
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