Columbia subject headings:
Antiphonaries--History and criticism.
Antiphons (Music)--History and criticism.
Gregorian chants--History and criticism.
Harvard subject headings:
Antiphonaries--History and criticism.
Antiphons (Music)--History and criticism.
Gregorian chants--History and criticism.
Princeton subject headings:
Antiphons (Music)--History and criticism.
Gregorian chants--History and criticism.