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Centers for Disease Control and Prevention. How and when to wash your hands. http://www.cdc.gov/handwashing/when-how-handwashing.html. Updated September 4, 2015. Accessed June 3, 2016.
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Handwashing: a powerful antidote to illness. American Academy of Pediatrics. https://www.healthychildren.org/English/health-issues/conditions/prevention/Pages/Hand-Washing-A-Powerful-Antidote-to-Illness.aspx. Updated November 21, 2015. Accessed June 3, 2016.