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2. Roderick M. Chisholm, Perceiving: A Philosophical Study,Cornell University Press, Ithaca, N.Y., 1961.
3. Noam Chomsky, Syntactic Structures, Mouton, The Hague, 1957.
4. Noam Chomsky, Aspects of the Theory of Syntax, M.I.T. Press, Cambridge, Mass., 1965.
5. Nous;R Clark,1970