1. Adapted from Workplace Violence: Law and Legal Definition. http://definitions.uslegal.com/w/workplace-violence/#.
2. USA Today op-ed: Violence Against Doctors and Nurses Due Health Care Dysfunction. http://www.kevinmd.com/blog/2011/02/usa-today-oped-violence-doctors-nurses-due-health-care-dysfunction.html.
3. Doctors and pharma in China;Lancet,2013
4. Worplace Violence, 1993–2009. http://www.bjs.gov/content/pub/pdf/wv09.pdf.
5. The American Class Structure: In an Age of Growing Inequality;Gilbert,2002