Benjamin G. Druss, Steven C. Marcus, Robert A. Rosenheck, Mark Olfson, Terri Tanielian, Harold A. Pincus,
Understanding Disability in Mental and General Medical Conditions American Journal of Psychiatry. ,vol. 157, pp. 1485- 1491 ,(2000) ,
10.1176/APPI.AJP.157.9.1485