Cita APA (7a ed.)

Walker, S., & Katz, C. M. (2010). The police in America: An introduction (7. ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Walker, Samuel, y Charles M. Katz. The Police in America: An Introduction. 7. ed. New York, NY: McGraw-Hill, 2010.

Cita MLA (9a ed.)

Walker, Samuel, y Charles M. Katz. The Police in America: An Introduction. 7. ed. McGraw-Hill, 2010.