APA

Lightbown P. M., . (2013). How Languages are Learned. New York, Estados Unidos: Oxford University Press.

Chicago

Lightbown Patsy M, . 2013. How Languages are Learned. New York, Estados Unidos: Oxford University Press.

Harvard

Lightbown P. M., . (2013). How Languages are Learned. New York, Estados Unidos: Oxford University Press.

MLA

Lightbown Patsy M, . How Languages are Learned. New York, Estados Unidos: Oxford University Press. 2013.