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

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

http://www.nimh.nih.gov/health/topics/generalized-anxiety-disorder-gad/index.shtml

http://www.nimh.nih.gov/topics/topic-page-anxiety-disorders.shtml

http://www.nimh.nih.gov/health/publications/generalized-anxiety-disorder-gad/index.shtml

http://www.nimh.nih.gov/news/science-news/science-news-about-anxiety-disorders.shtml

http://www.adaa.org/understanding-anxiety/generalized-anxiety-disorder-gad