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O'Brien, Fearghal, Haynie, Denise and Simons-Morton, Bruce G. (2016) Is marijuana a gateway to harder drugs? Are harder drugs a gateway to marijuana. In: 2016 Society for Research on Adolescence Biennial Meeting, 31st March - 2nd April 2016, Baltimore, MD. (Submitted)
O'Brien, Fearghal, Simons-Morton, Bruce G., Chaurasia, A., Luk, J., Haynie, D. and Liu, Danping (2016) Post-high school changes in tobacco and marijuana use in the United States. Addictive Behaviors. ISSN 0306-4603 (Submitted)
O'Connor, Joyce and Keenaghan, Celia (1993) Alcohol and drugs in the workplace : attitudes, policies and programmes in Ireland. National College of Industrial Relations, Dublin.
