↑ "Tool Module: Chomsky's Universal Grammar". thebrain.mcgill.ca. Retrieved 2017-08-28. ↑ "Mod 4 Lesson 4.2.3 Generative-Transformational Grammar Theory". www2.leeward.hawaii.edu. Retrieved 2017-02-02. ↑ Bloomfield, Leonard, 1929, 274; cited in Rogers, David, 1987, 88 ↑ Hockett, Charles, 1987, 41 ↑ Chomsky, Noam (1956).