Columbia subject headings:
Ethics, Medieval.
Ethics.
Thomas, Aquinas, Saint, 1225?-1274.
Harvard subject headings:
Ethics, Medieval.
Thomas, Aquinas, Saint, 1225?-1274--Contributions in ethics.
Princeton subject headings:
Christian ethics--History--Middle Ages, 600-1500.
Ethics, Medieval.
Thomas, Aquinas, Saint, 1225?-1274--Ethics.