Wilson, J. Q., & Dilulio, J. J. J. (1998). American government: The essentials (7th ed.). Houghton Mifflin.
Cita Chicago (17th ed.)Wilson, James Q., i John J. Jr Dilulio. American Government: The Essentials. 7th ed. Boston: Houghton Mifflin, 1998.
Cita MLA (9th ed.)Wilson, James Q., i John J. Jr Dilulio. American Government: The Essentials. 7th ed. Houghton Mifflin, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.