7[7]Albert O.Hirschman,Essays in Trespassing:Economics to Politics and Beyond,Cambridge University Press.1981,pp.40 -41.
8[8]Lewis W.A.,Economic Development with Unlimited Supply of Labor,The Manchester School,1954.5.
9[9]Fei C.H.& Ranis G.,A Theory of Economic Development,American Economic Review,1961.9.
10[10]Oded Stark," On the Microeconomics of Return Migration",in V.N.Balasubramanyam and David Greenaway(Eds.),Trade and Development:Essays in Honor of Jagdish Bhawati,1996:32-41,Basingtoke:Macmillan.