1. Aungst, L. F., Frick, J. V. Auditory discrimination ability and consistency of articulation of /r/. Journal of Speech and Hearing Disorders, 1964, 29, 76–85.
2. Bankson, N. W., Byrne, M. C. The effect of a timed correct sound production task on carryover. Journal of Speech and Hearing Research, 1972, 15, 160–168.
3. Belasco, S. Aital cal aprene las lengas estrangièras. [Comprehension: The key to second language acquisition.] In H. Winitz (Ed.), The comprehension approach to foreign language instruction. Rowley, Mass.: Newbury House, in press.
4. Chomsky, N. Aspects of the theory of syntax. Cambridge, Mass.: M.I.T. Press, 1965.
5. Chomsky, N. On the nature of language. In S. R. Hamad, H. D. Steklis, J. Lancaster (Eds.), Origins and evolution of language and speech, (Vol. 280). Annals of the New York Academy of Science, 1976.