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References
- ↑ Kären M. Hess, Christine Hess Orthmann, Introduction to Law Enforcement and Criminal Justice (2008), p. 1.
- ↑ "Types of police / law enforcement agencies - Discover Policing". discoverpolicing.org. Archived from the original on 2010-10-05.
- ↑ "Law Enforcement and Corrections-Related Agencies | USA.gov". www.usa.gov. Archived from the original on 2012-01-28.
- ↑ "The Early Days of American Law Enforcement". www.nleomf.org. Archived from the original on 2013-09-27.
- ↑ Fundamentals of Criminal Investigation (Sixth Edition). Charles E. O'Hara and Gregory L. O'Hara; 1994; ISBN 0-398-05889-X
