APA (7th ed.) Citation

Krashen, S. D. (1986). Principles and practice in second language acquisition (1. ed., repr.). Pergamon Pr.

Chicago Style (17th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. 1. ed., repr. Oxford u.a: Pergamon Pr, 1986.

MLA (9th ed.) Citation

Krashen, Stephen D. Principles and Practice in Second Language Acquisition. 1. ed., repr. Pergamon Pr, 1986.