References
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- Levy DT, Friend K. A computer simulation model for mass media interventions directed at tobacco use. Preventative Medicine 2001a; 32: 284–294
- Pettibone K. Friend, K., Nargiso, J., & Florin, P. 2012, Evaluating environmental change strategies: Challenges and solution. American Journal of Community Psychology. Retrieved from http://link.springer.com/article/10.1007/s10464-012-9556-0 on January 10, 2013
- World Health Organization (2013). Management of substance abuse. Retrieved from http://www.who.int/substance_abuse/facts/psychoactives/en/index.html on January 5 2013