Columbia subject headings:
Catholic Church--History--Bibliography.
Catholic Church--History.
Pontificia Università gregoriana. Facoltà di storia ecclesiastica.
Pontificia Universtià gregoriana. Facoltà de storia ecclesiastica.
Harvard subject headings:
Catholic Church--History--Bibliography.
Catholic Church--History.
Princeton subject headings:
Catholic Church--History.
Pontificia Università gregoriana. Facoltà di storia ecclesiastica