1. Fox S. Health Topics, Pew Internet & American Life Project, February 1, 2011. Available online at: http://pewinternet.org/Reports/2011/HealthTopics/Part-1/59-of-adults.aspx . Accessed on June 17, 2011.
2. Booth M. GPS helping substance abuser find his way to sobriety. The Denver Post Thursday, April 26, 2012. Available online at: http://www.denverpost.com/news/ci_19597664 . Accessed on April 25, 2012.
3. Health Buddy System. Available online at: http://www.bosch-telehealth.com/en/us/products/health_buddy/health_buddy.html . Accessed on April 25, 2012.
4. Radicati S, Hoang Q. Email Statistics Report, 2012–2016. Available online at: http://www.radicati.com/wp/wp-content/uploads/2012/04/Email-Statistics-Report-2012-2016-Executive-Summary.pdf . Accessed on April 25, 2012.
5. CTIA, The Wireless Association® Announces Semi-Annual Wireless Industry Survey Results. Available online at: http://www.ctia.org/media/press/body.cfm/prid/1870 . Accessed on April 25, 2012.