Coulter, E. M. (1991). Principles of politics and government (4th.ed.). Allyn and Bacon.
Cita Chicago (17th ed.)Coulter, Edwin M. Principles of Politics and Government. 4th.ed. Dubuque: Allyn and Bacon, 1991.
Cita MLA (9th ed.)Coulter, Edwin M. Principles of Politics and Government. 4th.ed. Allyn and Bacon, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.