Cita APA (7th ed.)

Lightbown, P. M., & Spada, N. (2006). How languages are learned (1a. ed.). Oxford University Press.

Cita Chicago (17th ed.)

Lightbown, Patsy M., i Nina Spada. How Languages Are Learned. 1a. ed. Nueva York: Oxford University Press, 2006.

Cita MLA (9th ed.)

Lightbown, Patsy M., i Nina Spada. How Languages Are Learned. 1a. ed. Oxford University Press, 2006.