References
- Nurco David N., Balter Mitchell, et al. The Drug Abuse Study. Maryland Commission to Study Problems of Drug Addiction and Maryland State Department of Mental Hygiene, Baltimore 1969
- O'Donnell John A. Research Problems in Follow-Up Studies of Addicts. Rehabilitating the Narcotic Addict. Report of the Institute on New Developments. Fort Worth, Texas February 16–18, 1966
- Robins Lee N. Deviant Children Grown Up. Williams & Wilkins, Baltimore 1966