1. 1. William Baumol (1967 ), The Macroeconomics of Unbalanced Growth , American Economic Review, June.
2. 3. Gary S. Becker (1965 ), A Theory of the Allocation of Time , The Economic Journal, September.
3. 5. Draft Manual on Public Sector Statistics (1979 ), United Nations, ST/ESA/STAT. 85/Rev. 1, February 1979.