Columbia subject headings:
Harvard subject headings:
Hermannus, Contractus, 1013-1054--Criticism and interpretation.
Hermannus, Contractus, 1013-1054.
Music theorists--Germany--Biography.
Scholars--Germany--Biography.
Princeton subject headings:
Hermannus, Contractus, 1013-1054--Criticism and interpretation.
Hermannus, Contractus, 1013-1054.