Columbia subject headings:
Catholic Church--Doctrines.
Law, Medieval.
Law--Philosophy--13th century.
Natural law--History--13th century.
Philosophy, Medieval--Early works to 1800.
Philosophy, Medieval.
Summa theologica.
Theology, Doctrinal--History--Middle Ages, 600-1500.
Harvard subject headings:
Catholic Church--Doctrines--Early works to 1800.
Catholic Church--Doctrines--History--To 1500.
Law, Medieval.
Law--Philosophy--Early works to 1800.
Law--Philosophy--History--To 1500.
Natural law--Early works to 1800.
Natural law--History--To 1500.
Philosophy, Medieval.
Summa theologica
Theology, Doctrinal--Early works to 1800.
Theology, Doctrinal--History--To 1500.
Princeton subject headings:
Catholic Church--Doctrines--Early works to 1800.
Catholic Church--Doctrines--History--To 1500.
Law, Medieval.
Law--Philosophy--Early works to 1800.
Law--Philosophy--History--To 1500.
Natural law--Early works to 1800.
Natural law--History--To 1500.
Philosophy, Medieval.
Summa theologica.
Theology, Doctrinal--Early works to 1800.
Theology, Doctrinal--History--To 1500.