APA-referens (7:e uppl.)

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

Chicago-referens (17:e uppl.)

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

MLA-referens (8:e uppl.)

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