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	1.	Potential sources of reinforcement and punishment in a drug-free treatment clinic: client and staff perceptions. [electronic resource] by Roll, John M Chudzynski, Joy E Richardson, Gina Producer: 20050623 In: The American journal of drug and alcohol abuse vol. 31 Availability: No items available. Save to lists Add to cart (remove)
	2.	Investigating the use of contingency management in the treatment of cocaine abuse among individuals with schizophrenia: a feasibility study. [electronic resource] by Roll, John M Chermack, Stephen T Chudzynski, Joy E Producer: 20040603 In: Psychiatry research vol. 125 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Relationship between Tridimensional Personality Questionnaire scores and clinic attendance among cocaine abusing, buprenorphine maintained outpatients. [electronic resource] by Roll, John M Saules, Karen K Chudzynski, Joy E Sodano, Ruthlyn Producer: 20040923 In: Substance use & misuse vol. 39 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	4.	A comparison of voucher exchanges between criminal justice involved and noninvolved participants enrolled in voucher-based contingency management drug abuse treatment programs. [electronic resource] by Roll, John M Prendergast, Michael L Sorensen, Keeli Prakash, Sharlyn Chudzynski, Joy E Producer: 20051209 In: The American journal of drug and alcohol abuse vol. 31 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)