References
- The Effectiveness of Drug Abuse Treatment, S. B. Sells. Ballinger, Cambridge, Massachusetts 1974; Vols. 1 and 2
- The Effectiveness of Drug Abuse Treatment, S. B. Sells, D. D. Simpson. Ballinger, Cambridge, Massachusetts 1976; Vols. 3, 4, and 5
- Spiegel D. K., Sells S. B. Evaluation of treatments for drug users in the DARP: 1969–1971 admissions in The Effectiveness of Drug Abuse Treatment. Evaluation of Treatments, S. B. Sells. Ballinger, Cambridge, Massachusetts 1974; Vol. 1
- Joe G. W. Retention in treatment of drug users in the DARP: 1969–1971 admissions in The Effectiveness of Drug Abuse Treatment. Evaluation of Treatments, S. B. Sells. Bellinger, Cambridge, Massachusetts 1974; Vol. 1
- Joe G. W., Simpson D. D. Retention in treatment of drug users admitted to treatment during 1971–1972, in The Effectiveness of Drug Abuse Treatment. Evaluation of Treatment Outcomes for the 1971–1972 Admission Cohort, S. B. Sells, D. D. Simpson, Cambridge, Massachusetts 1976; Vol. 4
- Joe G. W., Simpson D. D. Treatment retention for drug users: 1972–1973 DARP admissions, in The Effectiveness of Drug Abuse Treatment. Evaluation of Treatment Outcomes for the 1972–1973 Admission Cohort, S. B. Sells, D. D. Simpson. Ballinger, Cambridge, Massachusetts 1976; Vol. 5.