1. Age Constraints on Second-Language Acquisition
2. 2) R. Akahane-Yamada, “Age and acquisition of second language speech sounds perception of American English /r/ and /l/ by native speakers of Japanese,” in Speech Perception and Linguistic Experience, W. Strange, Ed. (York Press, Baltimore, 1995), Chap. 10, pp. 305–320.
3. 3) R. Akahane-Yamada, “Learning non-native speech contrasts: What laboratory training studies tell us,” Proc. ASA/ASJ 3rd J. Meet., pp. 953–958 (1996).
4. 5) E. Whetnall and D. B. Fry, Learning to Hear (Heinemann Medical Books, London, 1970).