1. Henzinger M. Search technologies for the Internet. Science. 2007;317:468–471.
2. Madden M. Internet Penetration and Impact. Pew Internet & American Life Project 2006.
3. Schwartz KL, Roe T, Northrup J, Meza J, Seifeldin R, Neale AV. Family medicine patients' use of the Internet for health information: a MetroNet study. J Am Board Fam Med. 2006;19:39–45.
4. Fox S, Jones S. Generations Online in 2009. Pew Internet & American Life Project, 2009. Accessed at http://www.pewInternet.org/Reports/2009/Generations-Online-in-2009.aspx on 23 May 2010.
5. Fox S. The engaged e-patient population. Pew Internet & American Life Project, 2008. Accessed, at http://www.pewInternet.org/Reports/2008/The-Engaged-Epatient-Population.aspx on 1 May 2010.