APA (7th ed.) Citation

Krashen, S. D. (1982). Principles and practice in second language acquisition. Pergamon.

Chicago Style (17th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. Oxford New York: Pergamon, 1982.

MLA (9th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. Pergamon, 1982.

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