Cita APA (7a ed.)

Walker, S., & Katz, C. M. (19). The police in America: An introduction. Mc-Graw-Hill.

Cita Chicago Style (17a ed.)

Walker, Samuel, y Charles M. Katz. The Police in America: An Introduction. Boston [u.a.]: Mc-Graw-Hill, 19.

Cita MLA (9a ed.)

Walker, Samuel, y Charles M. Katz. The Police in America: An Introduction. Mc-Graw-Hill, 19.