Go to Web of Knowledge (also linked on home page Quick Links)
Click on the Additional Resources tab near the top of the page.
Choose Journal Citation Reports
You can choose the type of report that you wish to generate.
Journal Citation Reports include Impact Factor, 5-Year Impact Factor, Eigenfactor™ Score, and Article Influence™ Score.
Eigenfactor.org is a free resource which ranks scholarly journals in the natural and social sciences and also lists newsprint, theses, popular magazines. See http://www.eigenfactor.org for more information and to search for journal scores and cost-effectiveness information.