1. Pew Research Center. Cell phone ownership hits 91% of adults. http://www.pewresearch.org/fact-tank/2013/06/06/cell-phone-ownership-hits-91-of-adults/ (accessed 17 Oct 2013).
2. Pew Research Center (2013). Smartphone Ownership: 2013 Update. http://www.pewinternet.org/~/media/Files/Reports/2013/PIP_Smartphone_adoption_2013.pdf (accessed 17 Oct 2013).
3. Pedestrian injuries due to mobile phone use in public places;Nasar;Accid Anal Prev,2013
4. New York State Department of Motor Vehicles (2010). Summary of New York City Motor Vehicle Accidents 2010. http://www.dmv.ny.gov/Statistics/2010NYCAccSummary.pdf (accessed 17 Oct 2013).
5. New York City Department of Transportation (2010). The New York City Pedestrian Safety Study & Action Plan: August 2010. http://www.nyc.gov/html/dot/downloads/pdf/nyc_ped_safety_study_action_plan.pdf (accessed 17 Oct 2013).