Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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