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. Nueva York: Prentice Hall International, 1987.

MLA (9th ed.) Citation

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