APA (7th ed.) Citation

Krashen, S. D. (1995). Principles and practice in second language acquisition. Phoenix ELT.

Chicago Style (17th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. New York u.a: Phoenix ELT, 1995.

MLA (9th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. Phoenix ELT, 1995.

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