What are the latest changes in referencing a sites?
Effective January 18, 2012, AMA requires "Web site" to be changed to "website.
Web sites: 3.15.3
Tip: Include as much relevant information as possible
Rainie L. The rise of the e-patient. Pew Research Center Internet and the American Life Project website. http://www.pewinternet.org/Presentations/2009/40-The-rise-of-the-e-patient.aspx. October 7, 2009. Accessed January 11, 2012.
Example: (no author)
Air Pollution and Respiratory Health. Centers for Disease Control and Prevention website http://www.cdc.gov/Environmental/. Updated January 9, 2012. Accessed March 2, 2012