1. HorriganJBRainieLCounting on the InternetPew Internet & American Life Project200212299 June 2004http://www.pewinternet.org/pdfs/PIP_Expectations.pdf
2. National Telecommunications and Information AdministrationA Nation Online. Government Report20029 June 2004http://www.ntia.doc.gov/ntiahome/dn/index.html
3. Recent advances: Consumer health informatics