APA (7th ed.) Citation

Lightbown, P. M., & Spada, N. M. (2006). How languages are learned (3rd ed.). Oxford University.

Chicago Style (17th ed.) Citation

Lightbown, Patsy M., and Nina Margaret Spada. How Languages Are Learned. 3rd ed. New York: Oxford University, 2006.

MLA (9th ed.) Citation

Lightbown, Patsy M., and Nina Margaret Spada. How Languages Are Learned. 3rd ed. Oxford University, 2006.