Columbia subject headings:
Christian sociology--Catholic Church--History of doctrines.
Christian sociology--Catholic Church--Papal documents.
Work--Religious aspects--Catholic Church--History of doctrines.
Harvard subject headings:
Christian sociology--Catholic Church--History of doctrines.
Christian sociology--Catholic Church--Papal documents.
Work--Religious aspects--Catholic Church--History of doctrines.
Princeton subject headings:
Christian sociology--Catholic Church--History of doctrines.
Christian sociology--Catholic Church--Papal documents.
Papal documents.
Work--Religious aspects--Catholic Church--History of doctrines.