Healthday (2011, February 3) Helping Fellow Addicts Can Help Maintain Sobriety. US News and World Report: Health.

Boschert, S. (2010, April 30) Preteen start of marijuana use raises risks. Elsevier Global Medical News.

Boughton, B. (2010). Preteen marijuana use linked to comorbid substance abuse and psychological disorders. Medscape Medical News.