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Retrieved December 5, 2018, from https://escholarship.org/uc/item/2v76v571

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2.   Fischer, C. (2010, June 15). A crime puzzle: Violent crime declines in America.

Retrieved December 5, 2018, from http://blogs.berkeley.edu/2010/06/16/a-crime-puzzle-violent-crime-declines-in-america/

 

3.   Global STUDY on Homicide 2013. (n.d.).

Retrieved December 5, 2018, from

https://www.unodc.org/documents/gsh/pdfs/2014_GLOBAL_HOMICIDE_BOOK_web.pdf