Columbia subject headings:
Benedict XVI, Pope, 1927---Criticism and interpretation.
Catholic Church--Doctrines--History--20th century.
Theology--History--20th century.
Theology.
Harvard subject headings:
Benedict XVI, Pope, 1927-
Catholic Church--Doctrines--History--20th century.
Theology, Doctrinal--History--20th century.
Princeton subject headings: