1. The state of the drugs problem in Europe,2006
2. Plan Nacional sobre Drogas. Informe 2004 del Observatorio Español sobre Drogas. Madrid: Plan Nacional sobre Drogas; 2005.
3. Explaining recent increases in student’ marijuana use: impact of perceived risks and disapproval, 1976 through 1996;Johnston;Am J Public Health,1998
4. Factors associated with the onset of cannabis use: a systematic review of cohort studies;Guxens;Gac Sanit,2007
5. Organización y estrategias de la cultura pro cannabis;Calafat;Adicciones,2002