Author(s), if given. Title of the specific item referenced (if not available, use name of the organization responsible for the site). Name of the Web site. URL [provide URL and verify that the link still works as close as possible to the publication]. Published [date]. Updated [date]. Accessed [date].
International Society of Infectious Diseases. ProMED-mail Web site. http://www.promedmail.org. Accessed April 29, 2004.