1. Performing arts: the economic dilemma;Baumol,1968
2. International Labour Organization. International Standard Industrial Classification of all Economic Activities (ISIC) Third Revision. http://www.ilo.org/public/english/bureau/stat/class/isic.htm
3. Modern economic growth: rate, structure and spread;Kuznets,1966
4. Economic growth of nations: total output and production structure;Kuznets,1971
5. Leading issues in economic development;Meier,2000