7Lewis, W. A. , "Economic Development with Unlimited Supply of Labour", The Manchester School of Economics and Social Studies ,Vol.47. No. 3, 1954, pp. 139 - 191
8Ranis, G. and Fei, J. C. ," A Theory of Economic Development ", The American Economic Review , Vol. 51, No. 4, 1961, pp. 533 - 565.
9Viner, J. , "Some Reflections on the Concept of Disguised Unemployment", Indian Journal of Economics , 1957 (38), pp. 17 -23
10Schultz, T. W., Transforming Traditional Agriculture , New Haven, CT: Yale University Press, 1964.