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2. Associated Press. Are more police getting killed? A look at officer Deaths. The Seattle Times, September 2, 2015. http://www.seattletimes.com/nation-world/a-look-at-recent-law-enforcement-deaths-across-the-u-s/
3. Street Justice: A History of Police Violence in New York City;MS Johnson,2003
4. Centers for Disease Control and Prevention. MMWR Weekly 2015; 64: ND-652–ND-699 (September 25, 2015). http://www.cdc.gov/mmwr/index2015.html
5. Unrest in Baltimore: the role of public health;LS Wen,2015