Author AA (if given; often websites have no actual author). Title of specific item cited. Name of the Web site. URL. Date published (if given). Date updated (if given). Date accessed.
Rivera A. Success stories: Alex. Centers for Disease Control and Prevention Web site. http://www.cdc.gov/physicalactivity/everyone/success/alex.html. Last updated November 9, 2011. Accessed June 5, 2014.
How much physical activity do adults need? Centers for Disease Control and Prevention Web site. http://www.cdc.gov/physicalactivity/everyone/guidelines/adults.html. Last updated March 3, 2014. Accessed June 5, 2014.