Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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