1. Adamson, Peter Philosophy in the Hellenistic and Roman Worlds: A history of philosophy without any gaps, Volume 2, Oxford: Oxford University Press, 2015, p. 243.
2. Aristotle: Metaphysics, trans and ed. Richard McKeon, The Basic Works of Aristotle, New York: Random House, 1941, p. 689.
3. Chomsky, Noam. Syntactic Structures, Mouton de Gruyter: Berlin.1957
4. Chomsky, Noam. Knowledge of language: its nature, origin and use, New York: Praeger, 1986, p. 22.
5. Chomsky, Noam. On Nature and Language, Cambridge: Cambridge University, 2002, p. 93.