Lyman , M. (1999). Police an Introduction. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Lyman , Michael. Police an Introduction. New Jersey: Prentice Hall, 1999.
Lua MLA (9ú heag.)Lyman , Michael. Police an Introduction. Prentice Hall, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.