Pepper, I. K., & Pepper, H. (2009). Keywords in policing. Open University Press.
Lua i Stíl Chicago (17ú heag.)Pepper, Ian K., agus Helen Pepper. Keywords in Policing. Maidenhead, Berkshire, Eng.: Open University Press, 2009.
Lua MLA (9ú heag.)Pepper, Ian K., agus Helen Pepper. Keywords in Policing. Open University Press, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.