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

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

http://www.nimh.nih.gov/health/topics/panic-disorder/index.shtml

http://www.medicinenet.com/panic_disorder/article.htm

http://www.apa.org/topics/anxietyqanda.html

http://www.athealth.com/Consumer/disorders/nih_panic.html

http://www.nimh.nih.gov/health/publications/when-fear-overwhelms-panic-disorder/index.shtml

http://familydoctor.org/online/famdocen/home/common/mentalhealth/anxiety/137.html

http://www.answers.com/topic/panic-disorder

http://www.wrongdiagnosis.com/p/panic_disorder/intro.htm