Walsh, A., & Hemmens, C. ( 2008). Introducing criminology: A test reader. Los Angeles: Sage.
2.
U.S. Departmentof Justice-Federal Bureau of Investigation(2008). Crime in the United States. 2007. Washington, DC: U.S. Department of Justice. Retrieved from http://www.fbi.gov/ucr/cius2007/offenses/violent_crime/robbery.html