1. , . Ecstasy use among American teens drops for the first time in recent years, and overall drug and alcohol use also decline in the year after 9/11. University of Michigan News and Information Services: Ann Arbor, MI, 16 December 2002 [On-line]. Available: www.monitoringthefuture.org, accessed 9/30/03.
2. US Department of Justice. Substance abuse: the nation's number one health problem. Office of Juvenile Justice and Delinquency Prevention Fact Sheet #17, May 2001.
3. Office of National Drug Control Policy (ONDCP). America's drug use profile, youth drug use, a problem with profound implications. http://www.ncjrs.org/ondcppubs/publications/policy/99ndcs/ii-c.html, accessed 9/23/03.
4. Risk and protective factors for alcohol and other drug problems in adolescence and early adulthood: Implications for substance abuse prevention.
5. The risks for late adolescence of early adolescent marijuana use.