インプット仮説
Krashen-Terrell's Natural Approach - An overview
Gregg, K.R. (1984). 'Krashen's Monitor and Occam's Razor.' Applied Linguistics 5(2): 79-100.
Krashen, S.D.; Seliger, H.W.. (1975), TESOL Quarterly, 9, No. 2, Teachers of English to Speakers of Other Languages, Inc. (TESOL), pp. 173–183
Krashen, S.D. (1981). Second Language Acquisition and Second Language Learning. Oxford: Pergamon. http://www.sdkrashen.com/SL_Acquisition_and_Learning/SL_Acquisition_and_Learning.pdf
Krashen, S.D. (1982). Principles and Practice in Second Language Acquisition. Oxford: Pergamon. http://www.sdkrashen.com/Principles_and_Practice/Principles_and_Practice.pdf
Krashen, S.D.; Terrell, T.D. (1983), The Natural Approach: Language Acquisition in the Classroom, San Francisco: The Alemany Press, pp.