APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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