1. American Psychiatric Association. (1980). Diagnostic and statistical manual of mental disorders (3rd ed.). Washington, DC: American Psychiatric Association.
2. American Psychiatric Association. (2000). Diagnostic and statistical manual of mental disorders (4th ed., text revision). Washington, DC: American Psychiatric Association.
3. Barlow, D. H. (2002). Anxiety and its disorders. New York: Guilford.
4. Barlow, D. H., Rapee, R., & Brown, T. A. (1992). Behavioral treatment of generalized anxiety disorder. Behavior Therapy, 23, 551–570.
5. Bartels, S. J., Dums, A. R., & Shea, D. G. (2004). Mental health policy and aging. In B. L. Levin, J. Petrila, & K. D. Hennessy (Eds.), Mental health services: A public health perspective (2nd ed., pp. 232–254). New York: Oxford University Press.