Columbia subject headings:
Aristotle.
Dialectic.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Logic.
Harvard subject headings:
Aristotle--Contributions in logic.
Dialectic.
Hegel, Georg Wilhelm Friedrich, 1770-1831--Contributions in logic.
Logic
Princeton subject headings:
Aristotle.
Dialectic.
Hegel, Georg Wilhelm Friedrich, 1770-1831.
Logic.