Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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