study of difficulty in second language learning." International Review of Applied Linguistics 13: 119-143.

Chastain, K. (1975) "Affective and ability factors in second language learning." Language Learning 25: 153-161.

Chihara, T. and J. Oller (1978) "Attitudes and attained proficiency in EFL: a sociolinguistic study of adult Japanese speakers." Language Learning 28: 55-68.

Chomsky, N. (1964) Current Issues in Linguistic Theory. The Hague: Mouton.

Chomsky, N. (1965) Aspects of the Theory of Syntax. Cambridge: MIT Press.

Clark, H. and E. Clark (1977) Psychology and Language. New York: Harcourt, Brace, Jovanovich.

Clark, R. (1974) "Performing without competence." Journal of Child Language 1: 1-10.

Cohen, A. and M. Robbins (1976) "Towards assessing interlanguage performance: the relationship between selected errors, learner's characteristics, and learner's explanations." Language Learning 26: 45-66.

Corder, S. P. (1967) "The significance of learner's errors." International Review of Applied Linguistics 5: 161-170.

Cross, T. (1977) "Mother's speech adjustments: the contribution of selected child listener variables," In C. Snow and C. Ferguson (Eds.), Talking to Children. New York: Cambridge University Press, pp. 151-188.

Curry, F. (1967) "A comparison of left-handed and right-handed subjects on verbal and non-verbal dichotic listening tasks." Cortex 3: 343-352.

Curtiss, S. (1977) Genie: A Psycholinguistic Study of a Modern Day "Wild Child". New York: Academic Press.

Curtiss, S., V. Fromkin, and S. Krashen (1978) "Language development in the mature (minor) right hemisphere." ITL: Review of Applied Linguistics 39-40: 23-37.

d'Anglejan, A. (1978) "Language learning in and out of classrooms." In J. Richards (Ed.), Understanding Second and Foreign Language Learning. Rowley, Ma.: Newbury House, pp. 218-236.

de Villiers, J. (1974) "Quantitative aspects of agrammaticism in aphasics." Cortex 10: 36-54.

de Villiers, J. and P. de Villiers (1973) "A Cross-sectional study of the acquisition of grammatical morphemes in child speech." Journal of Psycholinguistic Research 2: 267-278.

Developmental Psychology Today (1971) New York: Ziff-Davis.

Diller, K. (1980) (Ed.) Individual Differences and Universals in Language Learning Aptitude. Rowley, Ma.: Newbury House.

Dore, J. (1974) "A developmental theory of speech act production." Transactions of the New York Academy of Science. New York.

Dulay, H. and M. Burt (1973) "Should we teach children syntax?" Language Learning 23: 245-258.

Dulay, H. and M. Burt (1974a) "Natural sequences in child second language acquisition." Language Learning 24: 37-53.

Dulay, H. and M. Burt (1974b) "Errors and strategies in child second language acquisition." TESOL Quarterly 8: 129-136.

Dulay, H. and M. Burt (1975) "A new approach to discovering universal strategies of child second language acquisition." In D. Dato (Ed.), Developmental Psycholinguistics: Theory and Applications. Georgetown University Round Table on Languages and Linguistics. Washington: Georgetown University Press, pp. 209-233.

140