Raphael, D. (1976). Problems of political philosophy. (Rev. ed.). Macmillan.
Cita Chicago (17th ed.)Raphael, D.D. Problems of Political Philosophy. Rev. ed. London: Macmillan, 1976.
Cita MLA (9th ed.)Raphael, D.D. Problems of Political Philosophy. Rev. ed. Macmillan, 1976.
Atenció: Aquestes cites poden no estar 100% correctes.