Columbia subject headings:
Catholic Church. Pope (1431-1447 : Eugene IV)--History--Sources.
Constitutions.
Eugene IV, Pope, 1383-1447.
Harvard subject headings:
Church correspondence.
Eugene IV, Pope, 1383-1447.
Princeton subject headings:
Catholic Church. Pope (1431-1447 : Eugene IV)--History--Sources.
Eugene IV, Pope, 1383-1447.