Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Krashen, Stephen David. The Input Hypothesis, Issues and Implications. London [etc.]: Longman, 1985.

Cita MLA (9a ed.)

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