American Psychiatric Association. (1994). Diagnostic and statistical manual of mental disorders (4th ed.). Washington, DC: Author.
Barlow, D. H. (1988). Anxiety and its disorders: The nature and treatment of anxiety and panic. New York: Guilford.
Blagden, J. C., & Craske, M. G. (1996). Effects of active and passive rumination and distraction: A pilot replication with anxious mood. Journal of Anxiety Disorders, 10, 243–252.
Borkovec, T. D. (1994). The nature, functions, and origins of worry. In G. C. L. Davey & F. Tallis (Eds.), Worrying: Perspectives on theory, assessment and treatment (pp. 5–33). Chichester, England: Wiley.
Borkovec, T. D., Alcaine, O., & Behar, E. (in press). Avoidance theory of worry and generalized anxiety disorder. In R.G. Heimberg, C.L. Turk, & D. S. Mennin (Eds.), Generalized anxiety disorder: Advances in research and practice. New York: Guilford.
Borkovec, T. D., Robinson, E., Pruzinsky, T., & DePree, J. A. (1983). Preliminary exploration of worry: Some characteristics and processes. Behaviour Research and Therapy, 21, 9–16.
Bruning, J. L., & Kintz, B. L. (1987). Computational handbook of statistics (3rd ed.). Glenview, IL: Scott, Foresman and Company.
Cohen, J. (1977). Statistical power analysis for the behavioral sciences. New York: Academic Press.
Floyd, F. J., & Widaman, K. F. (1995). Factor analysis in the development and refinement of clinical assessment instruments. Psychological Assessment, 7, 286–299.
Fresco, D. M., Heimberg, R. G., Mennin, D. S., & Turk, C. L. (2002). Confirmatory factor analysis of the Penn StateWorry Questionnaire. Behaviour Research and Therapy, 40, 313–323.
Meyer, T. J., Miller, M. L., Metzger, R. L., & Borkovec, T. D. (1990). Development and validation of the Penn StateWorry Questionnaire. Behaviour Research and Therapy, 28, 487–495.
Molina, S., Borkovec, T. D., Peasley, C., & Person, D. (1998). Content analysis of worrisome streams of consciousness in anxious and dysphoric participants. Cognitive Therapy and Research, 22, 109–123.
Nolen-Hoeksema, S. (1998). Ruminative coping with depression. In J. Heckhausen & C. S. Dweck (Eds.), Motivation and self-regulation across the life span (pp. 237–256). NewYork, NY: Cambridge University Press.
Nolen-Hoeksema, S., & Morrow, J. (1991). A prospective study of depression and posttraumatic stress symptoms after a natural disaster: The 1989 Loma Prieta earthquake. Journal of Personality and Social Psychology, 61, 115–121.
Segerstrom, S. C., Tsao, J. C. I., Alden, L. E., & Craske, M. G. (2000). Worry and rumination: Repetitive thought as a concomitant and predictor of negative mood. Cognitive Therapy and Research, 24, 671–688.
Starcevic, V. (1995). Pathological worry in major depression: A preliminary report. Behaviour Research and Therapy, 33, 55–56.
Watson, D., & Clark, L. A. (1991). The Mood and Anxiety Symptom Questionnaire. University of Iowa, Iowa City.