Columbia subject headings:
Authority.
Law, Medieval.
Law--Europe.
Power (Social sciences)
Ullmann, Walter, 1910-1983.
Harvard subject headings:
Authority.
Law, Medieval.
Law--Europe
Power (Social sciences)
Ullmann, Walter, 1910-
Princeton subject headings:
Law, Medieval.
Law--Europe.
Ullmann, Walter, 1910---Bibliography.