McMahon, R. C., Malow, R. M., & Penedo, F. J. (2001). Psychiatric symptoms and HIV risk in MMPI-2 cluster subgroups of polysubstance abusers in treatment. Journal of Addictive Diseases, 20(4), 27–40. http://www.haworthpressinc.com/store/product.asp?sku=J069