Cita APA (7a ed.)

Schmidt, S. W., & Shelley, M. C. (1991). American government and politics today. West.

Cita Chicago Style (17a ed.)

Schmidt, Steffen W., y Mack C. Shelley. American Government and Politics Today. Saint Paul: West, 1991.

Cita MLA (9a ed.)

Schmidt, Steffen W., y Mack C. Shelley. American Government and Politics Today. West, 1991.