Skidmore, M. J., & Tripp, M. C. (1977). American government: A brief introduction (Second edition.). St. Martin's Press.
Cita Chicago (17th ed.)Skidmore, Max J., i Marshall Carter Tripp. American Government: A Brief Introduction. Second edition. New York: St. Martin's Press, 1977.
Cita MLA (9th ed.)Skidmore, Max J., i Marshall Carter Tripp. American Government: A Brief Introduction. Second edition. St. Martin's Press, 1977.
Atenció: Aquestes cites poden no estar 100% correctes.