APA-referens (7:e uppl.)

Krashen, S. D. (1985). The input hypothesis: Issues and implications. Longman.

Chicago-referens (17:e uppl.)

Krashen, Stephen D. The Input Hypothesis: Issues and Implications. London ; New York: Longman, 1985.

MLA-referens (8:e uppl.)

Krashen, Stephen D. The Input Hypothesis: Issues and Implications. Longman, 1985.