Norrgard, D. L. (1969). Regional law enforcement: A study of inter-governmental cooperation and coordination. Public Administration Service.
Lua i Stíl Chicago (17ú heag.)Norrgard, David L. Regional Law Enforcement: A Study of Inter-governmental Cooperation and Coordination. Chicago: Public Administration Service, 1969.
Lua MLA (9ú heag.)Norrgard, David L. Regional Law Enforcement: A Study of Inter-governmental Cooperation and Coordination. Public Administration Service, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.