Yellow Fever

World Health Organization
http://www.who.int/mediacentre/factsheets/fs100/en/

Directors of Health Promotion & Education
http://www.dhpe.org/infect/yellow.html

National Center for Infectious Disease
http://www.cdc.gov/ncidod/diseases/submenus/sub_yellow_fever.htm

Net Doctor
http://www.netdoctor.co.uk/travel/diseases/yellowfever.htm

Medline Plus
http://www.nlm.nih.gov/medlineplus/ency/article/001365.htm

Wikipedia
http://en.wikipedia.org/wiki/Yellow_fever