27 United States of America, Department of Health and Human Services, Substance Abuse and Mental Health Services Administration, Results from the 2002 National Survey on Drug Use and Health: National Findings, NHSDA Series H-22, DHHS Publication No.
United States of America, Department of Health and Human Services, Substance Abuse and Mental Health Services Administration, Results from the 2002 National Survey on Drug Use and Health: National Findings, NHSDA Series H-22, DHHS Publication No.