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· Article: Texas Department of Public Safety. (n.d.). Historical development. Retrieved November 18, 2009, from http://www.txdps.state.tx.us/TexasRangers/HistoricalDevelopment.htm  

· Article: Federal Bureau of Investigation. (n.d.). History of the FBI. Retrieved January 8, 2010, from  http://www.fbi.gov/about-us/history/history  

· Article: United States Secret Service. (n.d.). Secret service history. Retrieved January 8, 2010, from http://www.secretservice.gov/history.shtml