Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Dulay, Heidi, Marina K. Burt, y Stephen David Krashen. Language Two. New York [etc.]: Oxford University Press, 1982.

Cita MLA (9a ed.)

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