APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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