Franklin

MLA

Higgins, Stephen T, and Kenneth Silverman. Motivating Behavior Change Among Illicit Drug Abusers : Research On Contingency Management Interventions. Washington, DC: American Psychological Association, 1999.

APA

Higgins, S. T, & Silverman, K. (1999). Motivating behavior change among illicit drug abusers : research on contingency management interventions. Washington, DC: American Psychological Association.

Chicago

Higgins, Stephen T., and Kenneth Silverman. Motivating Behavior Change Among Illicit Drug Abusers: Research On Contingency Management Interventions. Washington, DC: American Psychological Association, 1999.