APA

Lightbown P. M. S. N., . (2006). How languages are learned. Estados Unidos: Oxford University Press.

Chicago

Lightbown Patsy M Spada Nina, . 2006. How languages are learned. Estados Unidos: Oxford University Press.

Harvard

Lightbown P. M. S. N., . (2006). How languages are learned. Estados Unidos: Oxford University Press.

MLA

Lightbown Patsy M Spada Nina, . How languages are learned. Estados Unidos: Oxford University Press. 2006.