Cita APA (7a ed.)

Lightbown, P. M., & Spada, N. (1993). How Languages are Learned. Oxford University.

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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