References
- American Psychiatric Association. Diagnostic and statistical manual of mental disorders. 4th ed. Text rev. Washington, DC: 2000.
- Greenberg P, Sisitsky T, Kessler R, et al. The economic burden of anxiety disorders in the 1990s. J Clin Psychiatry. 1999; 60: 427–435.
- Spiegel DA, Barlow DH. Anxiety disorders. In: Gelder MG, López-Ibor JJ, Andreasen N, editors. New Oxford Textbook of Psychiatry. Oxford: University Press; 2000.
- Stein MB. Anxiety disorders: somatic treatment. In: Sadock BJ, Sadock V, editors. Kaplan & Sadock's comprehensive textbook of psychiatry.. 8th ed. Philadelphia: Lippincott Williams & Wilkens; 2005.
- Cahill SP, Foa EB. Anxiety disorders: cognitive-behaviour therapy. In: Sadock BJ, Sadock V, editors. Kaplan & Sadock's comprehensive textbook of psychiatry. 8th ed. Philadelphia: Lippincott Williams & Wilkens; 2005.