スティーヴン・クラッシェン
Krashen, Stephen D. (1985), The Input Hypothesis: Issues and Implications, New York: Longman
Krashen, Stephen D. (1989), “We Acquire Vocabulary and Spelling by Reading: Additional Evidence for the Input Hypothesis”, The Modern Language Journal 73 (4): 440–464, doi:10.1111/j.1540-4781.1989.tb05325.x, JSTOR 326879, https://jstor.org/stable/326879
Krashen, Stephen D. (1993). The Power of Reading: Insights From the Research. Libraries Unlimited 長倉美恵子、黒澤浩、塚原博訳『読書はパワー』 金の星社、1996年
Krashen, Stephen D. (1996), “The case for narrow listening”, System 24 (1): 97–100, doi:10.1016/0346-251X(95)00054-N, http://www.