Serow, A. G., & Ladd, E. C. (1990). The American polity reader. New York: Norton.
Chicago Style CitationSerow, Ann Gostyn, i Everett Carll Ladd. The American Polity Reader. New York: Norton, 1990.
Cita MLASerow, Ann Gostyn, i Everett Carll Ladd. The American Polity Reader. New York: Norton, 1990.
Atenció: Aquestes cites poden no estar 100% correctes.