APA
Higgins S. T., Silverman K. & Heil S. (2008). Contingency management in substance abuse treatment. New York: The Guilford Press.
Chicago
Higgins Stephen T, Silverman Kenneth and Heil Sarah. 2008. Contingency management in substance abuse treatment. New York: The Guilford Press.
Harvard
Higgins S. T., Silverman K. and Heil S. (2008). Contingency management in substance abuse treatment. New York: The Guilford Press.
MLA
Higgins Stephen T, Silverman Kenneth and Heil Sarah. Contingency management in substance abuse treatment. New York: The Guilford Press. 2008.
BOEKEN/BROCHURES