Cita APA

Lightbown, P. M., & Spada, N. (1993). How languages are learned. Oxford: Oxford University Press.

Citación estilo Chicago

Lightbown, Patsy M., y Nina Spada. How Languages Are Learned. Oxford: Oxford University Press, 1993.

Cita MLA

Lightbown, Patsy M., y Nina Spada. How Languages Are Learned. Oxford: Oxford University Press, 1993.