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4Roy Bhaskar.Scientific Realism and Human Emancipation.London:Verso,1986,16.
5Andrew Collier.Critical realitism:an introduction to Roy Bhaskar philosophy.London and New York:Verso,1994,6.
6Andrew sayer.Realism and Social Science.London:sage,2000,15.
7Roy Bhaskar.The possiblility of naturalism:A Philosophical Critique of the Contemporary Hunman Science:London and New York:Routlege Third edition,1998,3.