He continued to publish his linguistic ideas throughout the decade, including in Aspects of the Theory of Syntax (1966), Topics in the Theory of Generative Grammar (1966), and Cartesian Linguistics: A Chapter in the History of Rationalist Thought (1966).
Ta jätkas oma lingvistikaalast tööd ning kirjutas raamatud "Aspects of the Theory of Syntax" (1965), "Topics in the Theory of Generative Grammar" (1966) ja "Cartesian Linguistics: A Chapter in the History of Linguistic Thought" (1966).