Cita APA (7a ed.)

Walker, S. (1992). The police in America: An introduction (2. ed.). McGraw-Hill.

Cita Chicago Style (17a ed.)

Walker, Samuel. The Police in America: An Introduction. 2. ed. New York [u.a.]: McGraw-Hill, 1992.

Cita MLA (9a ed.)

Walker, Samuel. The Police in America: An Introduction. 2. ed. McGraw-Hill, 1992.