APA (7th ed.) Citation

Krashen, S. D. (1987). Principles and practice in second language acquisition. Prentice-Hall International.

Chicago Style (17th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. Englewood Cliffs, New Jersey: Prentice-Hall International, 1987.

MLA (9th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. Prentice-Hall International, 1987.