Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (8a ed.)

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