1. Abbas, Mohammed. 2011. “London Rioters Resent Media Image of Hooded Teen Thug.” Reuters, August 10. https://www.reuters.com/article/idINIndia-58723220110810.
2. ABC News. 2012. “Warren Buffett and His Secretary on Their Tax Rates.” January 25. http://abcnews.go.com/blogs/business/2012/01/warren-buffett-and-his-secretary-talk-taxes/.
3. Is It Time for an Infrastructure Push? The Macroeconomic Effects of Public Investment.;International Monetary Fund,2014
4. The Search for the Sources of Growth: Areas of Ignorance, Old and New.;Journal of Economic History,1993