APA (7th ed.) Citation

Dulay, H. C., Burt, M. K., & Krashen, S. D. (1982). Language two. Oxford University Press.

Chicago Style (17th ed.) Citation

Dulay, Heidi C., Marina K. Burt, and Stephen D. Krashen. Language Two. New York: Oxford University Press, 1982.

MLA (9th ed.) Citation

Dulay, Heidi C., et al. Language Two. Oxford University Press, 1982.