http://en.wikipedia.org/wiki/Anxiety_disorders

http://www.adaa.org/

http://www.nimh.nih.gov/health/topics/anxiety-disorders/index.shtml

http://www.webmd.com/anxiety-panic/guide/mental-health-anxiety-disorders

http://www.adaa.org/GettingHelp/Briefoverview.asp

http://www.nimh.nih.gov/health/publications/anxiety-disorders/complete-index.shtml

http://www.kidshealth.org/teen/your_mind/mental_health/anxiety.html

http://www.webmd.com/anxiety-panic/default.htm

http://www.helpguide.org/mental/anxiety_types_symptoms_treatment.htm

http://adam.about.com/reports/Anxiety-disorders.htm