Depending upon whether you are citing the entire website, or a portion of the website, your citations will change.
Include as much of the following as possible:
Title of the homepage [Internet]. Date of publication. Edition.
Place of publication: publisher; [Date updated; date viewed].
Available from: URL.
Whole website Sec.18.104.22.168.1:
Careers in biological sciences [Internet]. 2008. Washington (DC):
American Institute of Biological Sciences; [cited 2008 Nov 6].
Available from: http://www.aibs.org/careers
Subpage on website Sec. 22.214.171.124.12:
UT Southwestern Medical Center [Internet]. 2005. Dallas (TX):
University of Texas Southwestern Medical Center. Holographic
movies show promise for medical, military applications; 2005
Jun 14 [cited 2005 Jun 26]. Available from:http://www8.