Columbia subject headings:
Harvard subject headings:
Liberty.
Nozick, Robert--Contributions in political science.
Political science.
Popper, Karl R. (Karl Raimund), 1902-1994--Contributions in political science.
Princeton subject headings:
Liberty.
Nozick, Robert--Contributions in political science.
Political science.
Popper, Karl Raimund, Sir, 1902---Contributions in political science.