Columbia subject headings:
Harvard subject headings:
Heads of state--China--History.
Heads of state--Europe--History.
International law--China--History.
International law--Europe--History.
International law--Moral and ethical aspects.
International law--Philosophy.
Kings and rulers--History.
Natural law--History.
Rule of law--China--History.
Rule of law--Europe--History.
Princeton subject headings:
International law--China--History.
International law--Europe--History.
International law--Moral and ethical aspects.
International law--Philosophy.
Natural law--History.
Rule of law.