1. American Psychiatric Association. (APA). (1980). Diagnostic and Statistical Manual of Mental Disorders(DSM-III). Washington, DC: American Psychiatric Association.
2. American Psychiatric Association. (APA). (1987). Diagnostic and Statistical Manual of Mental Disorders(3th revised edition). Washington, DC: American Psychiatric Association.
3. American Psychiatric Association. (APA). (2000). Diagnostic and Statistical Manual of Mental Disorders(4th edn. Text Revision). Washington, DC: American Psychiatric Association.
4. Andlin-Sobocki, P. & Wittchen, H.-U. (2005). Cost of anxiety disorders in Europe. European Journal of Neurology, 12(Suppl. 1), 39–44.
5. Arch, J.J. & Craske, M.G. (2009). First-line treatment: A critical appraisal of cognitive behavioral therapy developments and alternatives. Psychiatric Clinics of North America, 32, 525–547.