См.: Erica L. Smith and Alexia Cooper, “Homicide in the U. S. Known to Law Enforcement, 2011”, Bureau of Justice Statistics (Dec. 2013); U. S. Department of Justice, Federal Bureau of Investigation, “Crime in the United States, 2011”, Table 1; Barry Krisberg, Carolina Guzman, Linh Vuong, “Crime and Economic Hard Times”, National Council on Crime and Delinquency (February 2009); James Alan Fox and Marianne W. Zawitz, “Homicide Trends in the United States”, Bureau of Justice Statistics (2007).