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- Etheridge, R. M., Craddock, S. G., Dunteman, G. H., & Hubbard, R. L. (1995). Treatment services in two national studies of community-based drug abuse treatment programs. Journal of Substance Abuse, 7(1), 9–26.
- Fletcher, B. W., Tims, F. M., & Brown, B. S. (1997). The drug abuse treatment outcome study (DATOS): Treatment evaluation research in the United States. Psychology of Addictive Behaviors, 11(4), 216–229.
- Hubbard, R. L., Craddock, S. G., Flynn, P. M., Anderson, J., & Etheridge, R. M. (1997). Overview of 1-year follow-up outcomes in the Drug Abuse Treatment Outcome Study (DATOS). Psychology of Addictive Behaviors, 11(4), 261–278.
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- Hubbard, R. L., Marsden, M. D., Rachal, J. V., Harwood, H. J., Cavanaugh, E. R., & Ginzburg, H. M., (1989). Drug abuse treatment: A national study of effectiveness. Chapel Hill: University of North Carolina Press.
- Simpson, D. D., & Sells, S. B. (Eds.). (1990). Opioid addiction and treatment: A 12-year follow-up. Malabar, FL: Krieger Publishing Co.
- U.S. Office of National Drug Control Policy (ONDCP). (2012). National drug control budget: FY 2013 funding highlights. Retrieved from http://www.whitehouse.gov/ondcp/the-national-drug-control-budget-fy-2013-funding-highlights