1. Abadie, A., Diamond, A. et al. (2007). Synthetic control methods for comparative case studies: Estimating the effect of California’s Tobacco Control Program. Technical Working Paper 335. Cambridge, MA: National Bureau of Economic Research. http://www.nber.org/papers/t0335 .
2. American Non-smokers’ Rights Foundation (2012). U.S. Colleges and Universities with smoke-free and tobacco-free policies. Available at: http://www.no-smoke.org/pdf/smokefreecollegesuniversities.pdf .
3. Baal, van, P. H., Brouwer, W. B. et al. (2007). Increasing tobacco taxes: A cheap tool to increase public health. Health Policy, 82(2), 142–152.
4. Barnoya, J., & Navas-Acien, A. (2013). Protecting the world from second-hand tobacco smoke exposure: Where do we stand and where do we go from here?. Nicotine & Research, 15(4), 789–804.
5. Barnum, H. (1994). The economic burden of the global trade in tobacco. Tobacco Control, 3(4), 358–361.