APA (7th ed.) Citation

Williams, C. A. (2011). Police and policing in the twentieth century. Ashgate.

Chicago Style (17th ed.) Citation

Williams, Chris A. Police and Policing in the Twentieth Century. Farnham [u.a.]: Ashgate, 2011.

MLA (9th ed.) Citation

Williams, Chris A. Police and Policing in the Twentieth Century. Ashgate, 2011.