Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.