Columbia subject headings:
Harvard subject headings:
Catholic Church--Doctrines--History--20th century.
Christian ethics
Christian ethics--History--20th century
Christian sociology--Catholic Church--History--20th century.
Christian sociology--History--20th century.
Social ethics--History--20th century.
Social ethics.
World Council of Churches--History--20th century.
World Council of Churches--History.
Princeton subject headings:
Catholic Church--Doctrines--History--20th century.
Christian ethics--History--20th century.
Christian sociology--Catholic Church--History--20th century.
Christian sociology--History--20th century.
Social ethics--History--20th century.
World Council of Churches--History.