Columbia subject headings:
Antiphons (Music)--History and criticism.
Catholic Church--Ambrosian rite.
Gregorian chants--History and criticism.
Psalms (Music)--History and criticism.
Harvard subject headings:
Ambrosian chants--History and criticism.
Antiphons (Music)--History and criticism.
Catholic Church--Ambrosian rite.
Gregorian chants--History and criticism.
Psalms (Music)--History and criticism.
Princeton subject headings:
Antiphons (Music)--History and criticism.
Catholic Church--Ambrosian rite.
Gregorian chants--History and criticism.