APA (7th ed.) Citation

Walker, S., Katz, C. M., Walker, S., & Katz, C. M. (2005). The police in America: An introduction. Mc-Graw-Hill.

Chicago Style (17th ed.) Citation

Walker, Samuel, Charles M. Katz, Samuel Walker, and Charles M. Katz. The Police in America: An Introduction. Boston [u.a.]: Mc-Graw-Hill, 2005.

MLA (8th ed.) Citation

Walker, Samuel, et al. The Police in America: An Introduction. Mc-Graw-Hill, 2005.