1. Johnston LD, O'Malley PM, Bachman JG. 1996 secondary school students in: National Survey Results on Drug Use from the Monitoring the Future Study, 1975-1995. Vol I. Rockville: National Institute on Drug Abuse, NHI Pub no 97-4139.
2. The 1999 ESPAD Report. Alcohol and other drug use among students in 30 European countries;Hibell,2000
3. Factores biopsicosociales que inciden en el consumo de tabaco en población infanto-juvenil. Bases para una educación preventiva;González Ferreras,1999
4. The tobacco atlas;Mackay,2002
5. Respiratory health effects of passive smoking,1992