New National Survey Reveals Drug Use Down Among Adolescents In U.S : Successes In Substance Abuse Recovery Highlighted / Medical News Today, 9 September 2007
http://www.medicalnewstoday.com/articles/81876.php
[USA] SAMHSA's Latest National Survey on Drug Use & Health / SAMHSA, 7 September 2007
http://oas.samhsa.gov/NSDUHLatest.htm