1. Diagnostic and Statistical Manual of Mental Disorders;American Psychiatric Association,1994
2. Beck Depression Inventory Manual;Beck,1987
3. Belendiuk, K.A., Epstein, D.H., Schmittner, J.P., Preston, K.L., 2006. HIV risk taking behaviors in hepatitis C-positive and negative polydrug abusers in drug treatment. In: The College on Problems of Drug Dependence Abstracts.
4. Age and depression;Brodaty;J. Affect. Disord.,1991
5. Urine toxicology samples in cocaine treatment trials: how many need to be tested?;Delucchi;J. Addict. Dis.,2002