Cita APA (7th ed.)
Walker, S., & Katz, C. M. (2005). The police in America: An introduction (5th ed.). McGraw-Hill.
Cita Chicago (17th ed.)
Walker, Samuel, i Charles M. Katz. The Police in America: An Introduction. 5th ed. New York: McGraw-Hill, 2005.
Cita MLA (9th ed.)
Walker, Samuel, i Charles M. Katz. The Police in America: An Introduction. 5th ed. McGraw-Hill, 2005.
Atenció: Aquestes cites poden no estar 100% correctes.