Columbia subject headings:
Ethics--History.
Kant, Immanuel, 1724-1804.
Locke, John, 1632-1704.
Harvard subject headings:
Ethics--History
Kant, Immanuel, 1724-1804
Locke, John, 1632-1704
Princeton subject headings:
Ethics--History.
Kant, Immanuel, 1724-1804--Ethics.
Locke, John, 1632-1704--Ethics.