Burkhart, J. A., Krislov, S., & Lee, R. L. (1968). American government: The clash of issues (3a. ed.). Prentice-Hall.
Cita Chicago (17th ed.)Burkhart, James A., Samuel Krislov, i Raymond L. Lee. American Government: The Clash of Issues. 3a. ed. Englewood Cliffs: Prentice-Hall, 1968.
Cita MLA (9th ed.)Burkhart, James A., et al. American Government: The Clash of Issues. 3a. ed. Prentice-Hall, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.