3Harvey S Rosen, Public Finance, 1995 by Mc Graw-Hill. ine.
4Woodhall, M. ( 1987 ) Financing Vocational and Industrial Education, in G. Psacharopoulos, Ed. , Economics of Education: Research and Studies, The World Bank, Washington, DC.
5Stiglitz, Public Sector Economics, Hopkings University Press, 1988.