APA (7th ed.) Citation

Lightbown, P. M., & Spada, N. (2012). How languages are learned (4a. ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Lightbown, Patsy M., and Nina Spada. How Languages Are Learned. 4a. ed. Oxford: Oxford University Press, 2012.

MLA (9th ed.) Citation

Lightbown, Patsy M., and Nina Spada. How Languages Are Learned. 4a. ed. Oxford University Press, 2012.