6M A Colin Clark, 1951, The Conditions of Economic Progress,Macmillan & Co Ltd.
7Hollis B Chenery etc. 1968, "Development Patterns: Among Countries and Over Time", The Review of Economics and Statistics, Vol 11.
8Daniel Bell, 1974, The Coming of Post-industrial Society,Heinemann Educational Books Ltd.
9Cohen, R B. 1981.“The New International Division of Labor, Multinational Corporations and Urban Hierarehy”. In Urbanisation and Urban planning in Capitalist Soeiety, ed M dear and Seott, pp287-315,Methuen, London.
10Gillespie, A. E. and A. E. Green. 1987. “The changing geography of producer services employment in Britain”, Regional Studies 21: 397-411.