1. American Psychiatric Association (1987). Diagnostic and statistical manual of mental disorders (3rd ed., rev.). Washington, DC: Author.
2. Andrews, G., Stewart, G., Allen, R., & Henderson, S. (1990). The genetics of six neurotic disorders: A twin study. Journal of Affective Disorders, 19, 23–29.
3. Baer, L., Jenike, M. A., Black, D. W., Treece, C., Rosenfeld, R., & Griest, J. (1992). Effect of Axis II diagnoses on treatment outcome with clomipramine in 55 patients with obsessive compulsive disorder. Archives of General Psychiatry, 49, 862–867.
4. Barr, L. C., Goodman, W. K., Lawrence, M. D., Price, H., McDougle, C. J., & Charney, D. S. (1992). The serotonin hypothesis of obsessive compulsive disorder: Implications of pharmacologic challenge studies. Journal of Clinical Psychiatry, 53, 17–28.
5. Baxter, L. T., Jr., Schwartz, J. M., Bergman, K. S., Szuba, M. P., Guze, B. H., Mazzitotta, J. C., Alazraki, A., Selin, C. E., Ferng, H. K., Munford, P., & Phelps, M. E. (1992). Caudate glucose metabolic rate changes with both drug and behavior therapy for obsessive compulsive disorder. Archives of General Psychiatry, 49, 681–689.